Reproductive isolation is a mechanism through which species do not get to interbreed. Option D. reproductive isolation
What is reproductive isolation?This is a mechanism through which different species or populations do get to mate and produce fertile offspring. This mechanism allows the accumulation of genetic differences and favors speciation.
There are different barriers that inhibit or interrupt the genetic flow between different species.
Reproductive barriers prevent mating between two or more species. There are two types of barriers,
prezygotic ⇒ that avoids fertilization between individuals of different species, postzygotic ⇒ that impedes the zygote to develope and reach the adult stage.Pre-copulatory o pre-ziygotic:
• Ecological or by habitat isolation;
• Seasonal or temporal;
• Séxual o ethologic;
• Mechanic;
• Gametes incompatibility.
Postzygotic mechanisms or barriers include
• Hybrid inviability,
• Hybrid sterility,
• Cytoplasmic interactions.
In the exposed example occurs a seasonal difference between the mating period of the eastern spotted skunk and the western spotted skunk.
Probably, if both of them would mate during the same season and in the same area, they could reproduce.
However, since their mating season differs, individuals from each species do not get to cross and hence, produce fertile offspring.
Option D. reproductive isolation is what most likely prevents these two species from interbreeding
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In mammoths, assume that spotted skin (S) is dominant over non-spotted skin (s) and that wooly hair (W) is dominant over non-wooly hair (w). Cross a mating between a heterozygous spotted, non-wooly mammoth with a heterozygous wooly-haired, non-spotted mammoth. Give genotypic and phenotypic ratios of offspring.
Answer:
Genotypic and Phenotypic ratios → 1:1:1:1
25% of the progeny is expected to be SsWw, exhibiting spotted skin and wooly hair, SsWw25% of the progeny is expected to be Ssww, exhibiting spotted skin and non-wooly hair, Ssww25% of the progeny is expected to be ssWw, exhibiting non- spotted skin and wooly hair, ssWw25% of the progeny is expected to be ssww, exhibiting non-spotted skin and non-wooly hair, sswwExplanation:
Available data:
spotted skin (S) is dominant over non-spotted skin (s)wooly hair (W) is dominant over non-wooly hair (w)Cross: heterozygous spotted, non-wooly mammoth with a heterozygous wooly-haired, non-spotted mammoth.Parentals) Ssww x ssWw
Gametes) Sw, Sw, sw, sw
sW, sW, sw, sw
Punnett square) Sw Sw sw sw
sW SsWw SsWw ssWw ssWw
sW SsWw SsWw ssWw ssWw
sw Ssww Ssww ssww ssww
sw Ssww Ssww ssww ssww
F1) 4/16 = 1/4 = 25% of the progeny is expected to be SsWw, exhibiting spotted skin and wooly hair
4/16 = 1/4 = 25% of the progeny is expected to be Ssww, exhibiting spotted skin and non-wooly hair
4/16 = 1/4 = 25% of the progeny is expected to be ssWw, exhibiting non- spotted skin and wooly hair
4/16 = 1/4 = 25% of the progeny is expected to be ssww, exhibiting non-spotted skin and non-wooly hair.
Genotypic and Phenotypic ratios → 1:1:1:1
-)))
Calcium is the most abundant mineral in the human body. Calcium ions are needed for bone mineralization and tooth health,
regulation of the heart rate and strength of contraction, blood coagulation, contraction of smooth and skeletal muscle cells, and
regulation of nerve impulse conduction. When blood levels of calcium get too high, the thyroid gland is stimulated to release
calcitonin, which initiates actions to lower blood levels of calcium.
Consider the role of calcitonin. ALL BUT ONE is the result of the release of calcitonin by the thyroid gland.
A)
inhibits osteoclast activity
B)
stimulates calcium uptake by the bones
stimulates the synthesis of vitamin D
D)
decreases reabsorption of calcium by the kidneys
Answer:
decreases reabsorption of calcium by the kidneys
Explanation
from what ive found, calcitonin stops osteoclast activity, makes bones stronger, stimulates the sythesis of vitamin D, but does not (in anywhere i have read) decrease reabsorption in the kidneys. I really hope this helps.,,
if im wrong i am so sorry :(
Some plants in the desert, like cacti, have long roots and think stems to obtain and store water. What do we call these characteristics that increase a cactus's chance to survive in the desert?
A) Adaptations
B) Fossils
C) Speciation
D) Mutations
Answer:
Adaptation
Explanation:
1: Can The environment determines all physical features on plants?
2: Can The environment can affect physical features on plants?
No links!!!
Answer: When said that he was the one
Explanation: the first sentence is the nice loot
17
15. Some scientists use molecular evidence to study
evolution. One type of molecular evidence is
the amino acid sequence of particular proteins in
various species.
Which of the following best describes what the
study of these sequences reveals about the species?
A. The more similar the sequences are, the faster
the species will coevolve.
B. The more similar the sequences are, the more
closely related the species are.
C. The longer the sequences are, the earlier the
species evolved in geologic history,
D. The longer the sequences are, the more
adapted the species are to their environments.
Answer:
D
Explanation:
Because yes
3 types of animal like protest at least 3 types of plant like protest and at least 1 example of fungi like protozoan
Answer:
Animal-like protists include the flagellates, ciliates, and the sporozoans.
Explanation:
2. How do you think plant cells differ from animal cells?
Answer:
- Plant cells have a cell wall, animal cells don't
- Plant cells have chloroplasts, animal cells don't
- Plant cells have one or more large vacuole(s), animal cells have smaller vacuoles if any are present
- Animal cells don't have plastids, plant cells do
- Animal cells have irregular shapes
What best describes the role of molecular oxygen (O2) in cellular respiration? A. It is accepts electrons when reacting to form water. B. It combines with carbon and hydrogen to form glucose. OC. It is released when water breaks apart. D. It is released when glucose breaks apart. OE. It reacts to form carbon dioxide and water.
Answer:
D. It is released when glucose breaks apart.
Explanation:
Write the relationship between cells, tissue and organs in human body.
(plzzzzz answer correctly)
Answer:
Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
Explanation:
Describe the stages of invasion up to and including the spread stage. Also, include one barrier to could make
an invasion fail and briefly describe it.
Answer:
Introduction, naturalization, colonization, and dispersal or spreading.
Explanation:
There are four main stages of invasion i.e. introduction, naturalization, colonization, and dispersal or spreading. In the first stage, the specie is introduced in the environment, in the second stage the specie adopt the environment, in the third stage the specie started growth and make colonies to increase its population and in the last stage the specie disperse in the environment through different means and spreading of that organism occur. The failing of adaptation to the environmental conditions leads to the failing of invasion of a specie.
What is a biology? And what is learned?
Answer:
In biology, students study a variety of life processes and learn how different organisms meet the challenges of living in their environment. Major biological concepts for student focus include homeostasis, energy transfer and use, the relationship between structure and function, and change over time.
Explanation:
What are some Fun fact about elephant seal
6. In a non-competitive environment what is the result of a catastrophic disturbance? I
Answer:Ecologists generally distinguish between relatively small, frequent disturbances and large, infrequent, so-called "catastrophic" disturbances. ... Examples of the large, infrequent disturbances include volcanic eruptions, hurricanes, and major wildfires
Explanation:
Answer:
They typically cause a sudden decrease in population size, and in some cases may eliminate entire subpopulations
Explanation:
During the rock cycle, ______________ follows erosion. *
Answer:
deposition
Explanation:
Hope this helps and have a great day!!!!
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if u do it in 2 minitets giving brainly Est what are 3 ways animals find mates
1. Noises.
2. Scents.
3. Behavior.
Hope this helps!
what is needed in the plant for cell division
1. What do you know about gravity?
2. How could gravity affect the water cycle?
Explain your answer.''
Explanation:
What do you know about gravity?
ans:Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. Gravity is not just the attraction between objects and the Earth. It is an attraction that exists between all objects, everywhere in the universe. ... where G is called the Gravitational Constant.
How could gravity affect the water cycle?
ans:It pulls precipitation down from clouds and pulls water downhill. Gravity also moves air and ocean water. ... Gravity pulls denser air and water downward, forcing less dense air and water to move upward. The warm water near the surface of the ocean heats up with sunlight and evaporates, keeping the water cycle in motion.
HELP ME PLEASE!!!!!!!!!!
Which of the following is true?
A
The flow of gases varies directly with airway resistance.
As lung compliance increases, the energy required to breathe increases
Surfactant increases the cohesiveness of water molecules therefore decreasing
the surface tension of the alveolar fluid.
O Infant Respiratory Distress Syndrome occurs when there is a lack of surfactant
produced. THis is common in premature infants.
In healthy individuals, friction is a major factor affecting pulmonary ventilation
Answer: Infant Respiratory Distress Syndrome occurs when there is a lack of surfactant produced. This is common in premature infants.
Explanation:
Respiratory distress syndrome (RDS) is a well-known breathing disorder that is common in premature infants. It happens when there is a lack of surfactant produced in the baby's lungs which is quite bad because surfactant enables babies to breathe when they are born by keeping the lungs expanded.
It is common in premature infants because the lungs only begin to produce surfactant in the third trimester so babies that are born prematurely did not get to produce sufficient quantities. If not treated immediately, brain damage could follow.
Which situation is the best example of secondary succession?
A) An organism survives a difficult winter
B) The population in an area remains the same
C) One species replaces another species in an ecosystem after a forest fire
D) Each of several species uses the same amount of resources
Answer:
The answer is C
Explanation:
Secondary succession often occurs after a disaster, the ecosystem is not as primary as the primary succession, so it will take shorter time to recover. New species will occur in this place, and rebuild a constant environment. C is exactly the situation.
Hope this will help❤️
The best example of secondary succession is when one species replaces another species in an ecosystem after a forest fire. The correct option is C.
What is secondary succession?Secondary succession is a type of ecological succession that occurs on substrates that already have soil, and at least some organisms residing on it, like a forest or a community that has been disrupted by wildfire, tornadoes, or hurricanes.
The secondary succession in an ecosystem happens when a primary community is destroyed, for example, by wildfire. In secondary succession, the soil, seeds, and rhizomes survived in the soil and provides the foundation for the new community that is about to develop.
The rate of secondary succession varies according to the time taken for the primary community to regenerate, the level of disturbance of the habitat, the availability of propagules, and the dispersal capability of the species involved.
Therefore, the correct option is C.
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Answer is in a photo. I can only upload it to a file hosting service. link below!
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Answer:
C. Ecology.
Explanation:
The scientific study of the distribution and abundance of living organisms.
Which of the following is an example of planning for the future to avoid environmen damage?
A. Creating a landfill
B. Cleaning up an oil spill
C. Mining aluminum from the earth’s crust
D. Evaluating potential effects of development
Answer:
B is the answer
cleaning up an oil spill
Question 1 of 25 Which is part of the alimentary canal? A. Kidney B. Liver C. Heart D. Small intestine
Answer: it’s B
→Hope this help!←
Describing key processes about weathering and erosion. Use at least 6 answers to this.
What is the only place in cells where oxygen, enzyme, and food molecules can combine to release energy
Answer:
Cellular Resperarion
Explanation:
Answer:
During this stage, each pyruvate molecule in the cytoplasm enters the mitochondrion, where it is converted into acetyl CoA, a two-carbon energy carrier, and its third carbon combines with oxygen and is released as carbon dioxide.
Which of the following can be explained as a mathematical formula
A. An observation
B. A Scientific theory
C. A Scientific Law
D. A hypothesis
Answer:
B
Explanation:
1. Which of the following is not a practice to help conserve the ocean?
ban fishing of certain species
using different fishing equipment
allow fisherman to only fish for one species
rotating fish species for harvest
What
is a difference between systemic and pulmonary circulation?
Answer:
Systemic circulation carries oxygenated blood to the body and pulmonary circulation carries deoxygenated blood to the lungs.
Hope this helps!
Which characteristic is shown by doing the laundry even if a person dislikes doing it?
problem solving
self-discipline
aggression
sibling rivalry
Answer:
Self-Discipline
Explanation:
The others do not make sense.
Let me know if I have helped! :>
For a thunderstorm to occur there must be instability lift and _______? A. Moisture. B. Cold temperatures. C. A time between noon and 3:00
Answer:
A. Moisture.
Explanation:
There are three ingredients that must be present for a thunderstorm to occur. They are: MOISTURE, INSTABILITY, and LIFTING.
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