When one typical animal cell does mitosis the result is hapl

When one typical animal cell does mitosis, the result is haploid cells containing exactly the same alleles four haploid cells, each containing somewhat different alleles two diploid cells, each containing somewhat different alleles diploid cells, each with one allele for every gene none of the above Suppose that for some species, bristle length is by gene with complete dominance worm controlled one the X dominant to short). The gene for bristle length is not on An individual that is homozygous for long bristles parent will produce only short bristle offspring may have had a short bristle will produce only long bristle offspring mate will have either 1/2 or 3/4 of its offspring with long bristles, depending on its mate must produce about 1/2 of its offspring with long bristles, regardless of its mate Suppose that genes for wing size (A = long, a = short) and wing color (E = yellow, e = white) are linked for a species of grasshopper. Assume no crossing over occurs. If a grasshopper that is heterozygous for wing size and homozygous for white does meiosis many times, what will the gametes produced? Suppose that in some snail species, shell color is controlled by one gene with 2 alleles and complete dominance (R^1 = red, R^2 = white). If we cross homozygous red snails with in the homozygous white snails in a parent generation, what percentage of snails would be red F2 (not F1) generation? 0% 25% 50 75% 100% Two chromosomes that are homologous

Solution

8) The individual who is homozygous for long bristle will produce only long bristle offspring because long bristle is dominant. Even the presence of only one allele of the long bristle in the offspring will express the dominant phenotype.

9) The gametes will be 1/2 Ae and 1/2 ae

10) Homozygous red snails R1R1 X homozygous white snails R2R2

F1 Pink snails R1R2

F1 X F1 R1R2 X R1R2

1 R1R1 (red snails) : 2 R1R2 (pink snails) : 1 R2R2(white snails)

So the ration of red snails in F2 generation is 25 %