Evolutionary Analysis (5th Edition)
5th Edition
ISBN: 9780321616678
Author: Jon C. Herron, Scott Freeman
Publisher: PEARSON
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Chapter 5, Problem 16Q
The amino acid sequences encoded by the red and green visual pigment genes found in humans are 96% identical (Nathans et al. 1986). These two genes are found close together on the X chromosome, while the gene for the blue pigment is located on chromosome 7. Among primates, only Old World monkeys, the great apes, and humans have a third pigment gene—New World monkeys have only one X-linked pigment gene. Comment on the following three hypotheses:
- One of the two visual pigment loci on the X chromosome originated in a gene duplication event.
- The gene duplication event occurred after New World and Old World monkeys had diverged from a common ancestor, which had two visual pigment genes.
- Human males with a mutated form of the red or green pigment gene experience the same color vision of our male primate ancestors.
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You discover a new X-linked mutation for antenna shape in Drosophila (fruit flies) which produces long antennae. You call this new allele long (XL2), and discover it is incompletely dominant with the short antennae allele (XL1), so the heterozygotes (XL1XL2) have antennae that are intermediate in length (and XL2 homozygote females have long antennae). Males only have either long or short antennae. You cross a female with long antennae with a male with short antennae. What proportion of their male offspring do you expect to have short antennae?
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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?
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:
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…
Chapter 5 Solutions
Evolutionary Analysis (5th Edition)
Ch. 5 - What is the difference between genetic variation,...Ch. 5 - We noted on the first page of the chapter that...Ch. 5 - Because you are studying different subjects, the...Ch. 5 - What are reaction norms, and why do they matter?...Ch. 5 - Consider the nucleotide sequence TGACTAACGGCT....Ch. 5 - Consider a population containing the following...Ch. 5 - How many redheads live in a village of 250 people,...Ch. 5 - Diagram two processes through which genes can be...Ch. 5 - If a gene gets retroduplicated, how can you...Ch. 5 - How do chromosome inversions happen? What...
Ch. 5 - Diagram the sequence of events that leads to the...Ch. 5 - Discuss factors that might cause mutation rates to...Ch. 5 - Which kind of mutation is most common: lethal,...Ch. 5 - Compare and contrast the evolutionary roles of...Ch. 5 - Suppose a silent mutation occurs in an exon that...Ch. 5 - The amino acid sequences encoded by the red and...Ch. 5 - Chromosome number can evolve by smaller-scale...
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