1.) White fruit color in summer squash is governed by a dominant gene (W) and co
ID: 53817 • Letter: 1
Question
1.) 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?
a) all white
b) 1/2 white, 1/2 yellow
c) 1/2 white, 1/4 yellow, 1/4 green
d) 1/2 white, 1/2 green
e) 1/4 white, 1/2 yellow, 1/4 green
2.) 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.
http://i62.tinypic.com/amz960.jpg
Using the same information in the question above, what is the genotype of a pure-breeding red strain of parakeet? Select all that apply (may have more than one).
a) aaBBccdd
b) AAbbccdd
c) AAbbccDD
d) AAbbCCDD
a) aaBBccdd
b) AAbbccdd
c) AAbbccDD
d) AAbbCCDD
e) aaBBCCDD f) AAbbCCdd g) AABBCCDD h) aaBBccBB i) aaBBCCddExplanation / Answer
1. WW crossed with ww = Ww (All plants will be white).
Yy crossed with yy = 50% Yy(yellow) and 50% yy (green)
In the given cross wwYy to WWyy = Result is Wwyy(white) : WwYy (white)
So, the entire progeny will be white (option a).
2. Pure breeding red strain will contain AA genotype always. so, the correct options should be
b) AAbbccdd
c) AAbbccDD
d) AAbbCCDD
b) AAbbccdd
c) AAbbccDD
d) AAbbCCDD
f) AAbbCCdd g) AABBCCDDRelated Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.