One of the X chromosomes in a particular Drosophila female had a normal order of genes but carried recessive alleles of the genes for yellow body color (y), vermilion eye color (v), and forked bristles (f), as well as the dominant X-linked Bar eye mutation (B). Her other X chromosome carried the wild-type alleles of all four genes, but the region including y+, v+, and f+ (but not B+) was inverted with respect to the normal order of genes. This female was crossed to a wild- type male in the cross diagrammed her.The cross produced the following male offspring:* table in figurea. Why are there no male offspring with the allele combinations y v f+, v+ v+ f, y v+ f+, or y+ v f (regardless of the allele of the Bar eye gene)?b. What kinds of crossovers produced the y v f b+ and v+ y+ f+ B offspring? Can you determine any genetic distances from these classed of progeny?c. What kinds of crossovers produced the y+ v f+ B+ and y v+ f B offspring? 18. One of the X chromosomes in a particularDrosophila female had a normal order ofgenes but carried recessive alleles of thegenes for yellow body color (y), vermilion eyecolor (v), and forked bristles (f), as well as thedominant X-linked Bar eye mutation (B). Herother X chromosome carried the wild-typealleles of all four genes, but the regionincluding y+, v+, and f+ (but not B+) wasinverted with respect to the normal order ofgenes. This female was crossed to a wild-type male in the cross diagrammed her.VfBBvtYB+The cross produced the following male offspring:yVfB48y+V+f+B+45yVfB+11y+V+f+B8yVfB1y+V+f+B+1a. Why are there no male offspring with theallele combinations y v f+, v+v+ f, y v+ f+, ory+ v f (regardless of the allele of the Bar eyegene)?b. What kinds of crossovers produced the y v fb+ and v+y+ f+ B offspring? Can youdetermine any genetic distances from theseclassed of progeny?c. What kinds of crossovers produced the y+ vf+ B+ and y v+ f B offspring?

Crossing over: It occurs during prophase I and involves the exchange of genetic material between…

Answered: One of the X chromosomes in a…

Human Anatomy & Physiology (11th Edition)

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Author:Elaine N. Marieb, Katja N. Hoehn

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Chapter1: The Human Body: An Orientation

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One of the X chromosomes in a particular Drosophila female had a normal order of genes but carried recessive alleles of the genes for yellow body color (y), vermilion eye color (v), and forked bristles (f), as well as the dominant X-linked Bar eye mutation (B). Her other X chromosome carried the wild-type alleles of all four genes, but the region including y+, v+, and f+ (but not B+) was inverted with respect to the normal order of genes. This female was crossed to a wild- type male in the cross diagrammed her.

The cross produced the following male offspring:
* table in figure

a. Why are there no male offspring with the allele combinations y v f+, v+ v+ f, y v+ f+, or y+ v f (regardless of the allele of the Bar eye gene)?
b. What kinds of crossovers produced the y v f b+ and v+ y+ f+ B offspring? Can you determine any genetic distances from these classed of progeny?
c. What kinds of crossovers produced the y+ v f+ B+ and y v+ f B offspring?

18. One of the X chromosomes in a particular
Drosophila female had a normal order of
genes but carried recessive alleles of the
genes for yellow body color (y), vermilion eye
color (v), and forked bristles (f), as well as the
dominant X-linked Bar eye mutation (B). Her
other X chromosome carried the wild-type
alleles of all four genes, but the region
including y+, v+, and f+ (but not B+) was
inverted with respect to the normal order of
genes. This female was crossed to a wild-
type male in the cross diagrammed her.
V
f
B
B
vt
Y
B+
The cross produced the following male offspring:
y
V
f
B
48
y+
V+
f+
B+
45
y
V
f
B+
11
y+
V+
f+
B
8
y
V
f
B
1
y+
V+
f+
B+
1
a. Why are there no male offspring with the
allele combinations y v f+, v+v+ f, y v+ f+, or
y+ v f (regardless of the allele of the Bar eye
gene)?
b. What kinds of crossovers produced the y v f
b+ and v+y+ f+ B offspring? Can you
determine any genetic distances from these
classed of progeny?
c. What kinds of crossovers produced the y+ v
f+ B+ and y v+ f B offspring?

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