1) Consider a single germ cell with the genotype A/a;B/b undergoing meiosis. Which of the following...
1)
Consider a single germ cell with the genotype A/a;B/b undergoing meiosis. Which of the following are possible genotypes for the set of four gametes resulting from meiosis of this single germ cell? (assume that there is NOT any nondisjunction)
A, a, B, b
Aa, Aa, Bb, Bb
AB, Ab, aB, ab
Ab, Ab, aB, aB
aa, AA, BB, bb
2) From true-breeding stocks, a female fly with no eyes (mutation in eyeless (ey) gene) and no wings (mutation in wingless (wg) gene) is crossed to a wild-type male. All F1 flies have eyes and wings. These F1 flies were testcrossed and the ey and wg genes were found to be located 18 cM apart on the same autosome.
What percentage of the flies are expected to have wild-type wings, but no eyes?
Express your answer as an integer between 0 and 100.
3) Consider this cross: AAbb x aaBB
Genes A and B are on the same chromosome.
Which of the following is the correct phased genotypic notation for the offspring?
Ab/aB
ab/AB
Aa/bB
Aa/Bb
4) According to University of Queensland geneticist Rick Sturm, “There is no single gene for eye color, but the biggest effect gene is OCA2.” Assume each wild-type OCA2 allele adds 200 units of melanin (a dark pigment) to eye color, whereas a mutant OCA2 allele adds 0 units of melanin. Melanin production in the eyes is also affected by four other genes (a, b, c, and d). Assume that each wild-type allele of these four other genes adds 10 units of melanin and that the mutant allele of each gene adds 0 units of melanin. Assume, as is usually done for quantitative traits, that all genes interact additively and alleles are co-dominant. All genes are also autosomal and unlinked. How many units of melanin are present in an individual heterozygous for all five eye color genes?
400
200
240
480
440
Homework Answers
As per the Chegg guidelines I can answer the first question only. Kindly post the questions separately. Thanks and Regards.
1. If a germ cell of genotype A/a;B/b undergoes meiosis, it will produce 4 haploid gametes which will have two alleles. According to Mendel, the alleles segregate and assort independently during gametogenesis. So, 4 gametes will have AB, Ab, aB & ab genotypes assuming that there is no nondisjunction.
Answer. AB, Ab, aB, ab.
Add Answer to:
1)
Consider a single germ cell with the genotype A/a;B/b undergoing
meiosis. Which of the following...
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A) Only one of the strains has a mutation in an eye color
gene.
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C) Strains C and D have mutations in the same gene.
D) More information is needed to infer the location of
mutations.
! Required information Fruit flies normally have red eyes. Seven different true-breeding strains of fly with white eyes have been identified (A–G). In each strain, the white eye trait is due to...
The inheritance of eye color in Drosophila is controlled by
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red) allele is dominant over the mutant vermilion (bright red)
allele. A homozygous wild-type female fly is mated with a vermilion
male fly. X+ X+ * X^p Y Predict the eye colors of F1 and F2...
Answer Choices:
A) No
B) More information is needed to determine eye color
C) Yes
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