1.) Gene R and gene T are genetically linked. Answer the following question conc
ID: 53691 • Letter: 1
Question
1.) Gene R and gene T are genetically linked. Answer the following question concerning a dihybrid organism with the genotype Rt/rT. If the frequency of recombinant gametes is 25%, give the expected frequencies of each gamete produced by the dihybrid.
A) The gametes will be 37.5% Rt, 37.5% rT, 12.5% RT, and 12.5% rt.
B) The gametes will be 25% Rt, 25% rT, 25% RT, and 25% rt.
C) The gametes will be 12.5% RT, 12.5% Rt, 37.5% rt, and 37.5% rT.
D) The gametes will be 37.5% RT, 37.5% rt, 12.5% Rt, and 12.5% rT.
2.) White fruit color in summer squash is governed by a dominant gene (W) and colored fruit by its recessive allele (w). Yellow fruit is governed by an independently assorting hypostatic gene (Y) and green by its recessive allele (y). When dihybrid plants are crossed, the offspring appear in the ratio of 12 white : 3 yellow : 1 green. What fruit color ratio is expected from the cross of wwYy to WWyy?
3.) Feather color in parakeets is produced by the blending of pigments produced from two biosynthetic pathways shown below. Four independently assorting genes (A, B, C, and D) produce enzymes that catalyze separate steps of the pathways. For the questions below, use an uppercase letter to indicate a dominant allele producing full enzymatic activity and a lowercase letter to indicate a recessive allele producing no functional enzyme. Feather colors produced by mixing pigments are green (yellow + blue) and purple (red + blue). Red, yellow, and blue feathers result from production of one colored pigment, and white results from absence of pigment production. Do not leave any spaces in your answer. For example: AABBCCDD.
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What is the genotype of a pure-breeding red strain of parakeet? (may have more than one).
A) The gametes will be 37.5% Rt, 37.5% rT, 12.5% RT, and 12.5% rt.
B) The gametes will be 25% Rt, 25% rT, 25% RT, and 25% rt.
C) The gametes will be 12.5% RT, 12.5% Rt, 37.5% rt, and 37.5% rT.
D) The gametes will be 37.5% RT, 37.5% rt, 12.5% Rt, and 12.5% rT.
Explanation / Answer
Answer to Q 1)
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