Answer:
Cell A: sperm
Sex of Rabbit: Male
Offspring are not genetically identical because of the crossing over period in meiosis. Pieces of chromosomes switch places, producing genetically unique gametes/sex cells. Also, during fertilization, the offspring gets 1/2 its DNA from the mother and the other 1/2 from the father, so it will not be identical to either parent.
The medulla oblongata is the center of the brain responsible for circulation and respiration. It helps regulate breathing, digestion, sneezing, swallowing, and heart and blood vessel function.
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<em><u>How could genetic variation affect new adaptations?</u></em>
<em>Populations adapt to novel environments in two distinct ways: selection on pre-existing genetic variation and selection on new mutations. These alternative sources of beneficial alleles can result in different evolutionary dynamics and distinct genetic outcomes. Compared with new mutations, adaptation from standing genetic variation is likely to lead to faster evolution, the fixation of more alleles of small effect and the spread of more recessive alleles. </em>
<em>So you may be asking.... why? And how?</em>
<em>There is potential to distinguish between adaptation from standing variation and that from new mutations by differences in the genomic signature of selection. Here we review these approaches and possible examples of adaptation from standing variation in natural populations. Understanding how the source of genetic variation affects adaptation will be integral for predicting how populations will respond to changing environments.</em>
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Phenotypically and genotypically there are only two different ratios. If you think of a Punett square...
<span>You could say that a pea plant with the trait for the dominant color green (G) could also carry the recessive trait for yellow (g). So let's say you mate a dominant green, (Gg) with another dominant green, (Gg). You would get 1 (GG), 2 (Gg) and 2 (gg). </span>
<span>Phenotypically (as in physical traitwise), the ratio is 3:1 because you have 3 green colored peas and one yellow. </span>
<span>Genotypically (as in traitwise), the ratio is 1:2:1, because you have 1 (GG), 2 (Gg) and 1 (gg). </span>
<span>So although it's random, for any specific trait there are only 4 different outcomes.</span>
Cactus because they have visible leaf modification that preserves water for a long time in dry conditions