6. From the bits of plants remaining in the guts of some insects, researchers we
ID: 6794 • Letter: 6
Question
6. From the bits of plants remaining in the guts of some insects, researchers were also able to clone some of the Jurassic vegetation. They found that in one species of plants, the flowers came in two colors, but that color was controlled by two genes that are on separate chromosomes. One gene determines if any flower color pigment will be made at all (color is dominant to no color). The second gene determines which color pigment will be produced. Here A = Red, while a = pink.a. If you were to cross two plants with the genotypes CCAA X ccaa, what would you expect the genotype and phenotype of the F1 to be?
b. If you were to cross the F1 with each other, what phenotypic ratio would you expect in the F2, and what genotypes would be included in each phenotype?
Explanation / Answer
Well the answer to the first question would be that the F1 generation would all be heterozygous for both traits because both the parents are homozygous for both traits.One parent has the dominant version the other the recessive for both of the traits. Answering the next question the phenotypic ratio of the F2 generation will be a 9:3:3:1 ratio. The genotypes that the cross would yield are as follows: CCAA=1 CCAa=2 CaAA=2 CcAA=2 CcAa=4 ccAA=1 ccAa=2 Ccaa=2 CCaa=1 ccaa=1 For the most part my crosses should be acurrate if you wanna check it for yourself draw up the punnett square ( a 4x4 grid for dihybrids) and draw out the cross for the heterozygotes of the F1 Generation CcAa x CcAa. If you find yourself stuck feel free to send me a message and I'll help you out.
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