Could you please take a look at the attached problems that I have done which include Punnett square and genotype.
I think I have done the problems correctly but I just need a second set eyes to see if there are any holes in my understanding on this topic.© BrainMass Inc. brainmass.com October 24, 2018, 5:17 pm ad1c9bdddf
1. The genotypes should include both alleles, e.g. the man must be Ee because his daughter is normal--if he were EE, she would have 6 digits since the trait is dominant. So, the daughter and mother must both be ee. Giving only one allele as you have does not give enough information about genotypes. Remember, people have two alleles of each gene (excluding those on the X- or Y- chromosome), one from mom, the other from dad.
<br><br>The Punnett Square, then, would be Ee x ee.
<br><br>I'm not ...
Genetics - Genotypes, Punnett Squares
In fruit flies, the phenotype for eye color is determined by a certain locus. E indicates the dominant allele and e indicates the recessive allele. The cross between a male wild type fruit fly and a female white-eyed fruit fly produced the following offspring.
Wild-type Wild-type White-eyed White-eyed Brown-eyed
male female male female female
F1 0 45 55 0 1
The wild-type and white-eyed individuals from the F1 generation were then crossed to produce the following offspring.
F2 23 31 22 24 0
(a) Determine the genotypes of the original parents (P generation) and explain your reasoning. You may use Punnett squares to enhance your description, but the results from the Punnett squares must be discussed in your answer.
(b) Use a Chi-squared test on the F2 generation data to analyze your prediction of the parental genotypes. Show all your work and explain the importance of your final answer.
(c) The brown-eyed female in the F1 generation resulted from a mutational change. Explain what a mutation is, and discuss two types of mutations that might have produced the brown-eyed female in the F1 generation.