Genetics: From Genes to Genomes
6th Edition
ISBN: 9781259700903
Author: Leland Hartwell Dr., Michael L. Goldberg Professor Dr., Janice Fischer, Leroy Hood Dr.
Publisher: McGraw-Hill Education
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Chapter 21, Problem 24P
In Drosophila, the vestigial wings recessive allele, vg, causes the wings to be very small. A geneticist crossed some true-breeding wild-type males to some vestigial virgin females. The male and female F1 flies were wild type. He then allowed the F1 flies to mate with one another and found that 1/4 of the male and female F2 flies had vestigial wings. He dumped the vestigial F2 flies into a morgue and allowed the wild-type F2 flies to mate and produce an F3 generation.
| a. | Give the genotype and allele frequencies among the wild-type F2 flies. |
| b. | What will be the frequencies of wild-type and vestigial flies in the F3? |
| c. | Assuming the geneticist repeated the selection against the vestigial F3 flies (that is, he dumped them in a morgue and allowed the wild-type F3 flies to mate at random), what will be the frequency of the wild-type and mutant alleles in the F4 generation? |
| d. | Now the geneticist lets all of the F4 flies mate at random (that is, both wild-type and vestigial flies mate). What will be the frequencies of wild-type and vestigial F5 flies? |
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Two different strains of Drosophila, strain A and strain B, each has a recessive mutation that results in abnormally bright red eye color. (Wild type flies have brownish red eye color). When a homozygous strain A fly is crossed with a homozygous B fly, all of the progeny have the dominant wild type eye color. The wild type-eyed progeny were allowed to breed among themselves to produce the F2 generation. The F2 generation consisted of 92 wild type and 74 bright red-eyed flies.
Write the genotype(s) of the flies in each generation. Use a low dash (e.g. A_ B_) to indicate genotypes that could be either homozygous or heterozygous)
a) parental strain A
b) parental strain B
c) wild type progeny (F1)
d) wild type F2
e) bright-eyed F2
In Drosophila, males from a true-breeding
stock with raspberry-colored eyes (instead of
normal brownish-red eyes) were mated to
females from a true-breeding stock with sable-
colored bodies (instead of normal brown
bodies). In the F, generation, all the females
had wild-type eye and body color, while all the
males had wild-type eye color but sable-colored
bodies. When F, males and females were
mated, the F generation was composed of:
216 females with wild-type eyes and bodies
223 females with wild-type eyes and sable bodies
191
males with wild-type eyes and sable bodies
188 males with raspberry eyes and wild-type bodies
23 males with wild-type eyes and bodies
27 males with raspberry eyes and sable bodies.
Explain these results by diagramming the
crosses and calculating any relevant map
distances.
In Drosophila, males from a true-breeding stock with raspberry-colored eyes were mated to females from a true-breeding stock with sable-colored bodies. In the F1 generation, all the females had wild-type eye and body color, while all the males had wild-type eye color but sable-colored bodies. When F1 males and females were mated to each other, the F2 was composed of:
216 females with wild-type eyes and wild-type bodies
223 females with wild-type eyes and sable bodies
191 males with wild-type eyes and sable bodies
188 males with raspberry eyes and wild-type bodies
23 males with wild-type eyes and bodies
27 males with raspberry eyes and sable bodies
Which statements are consistent with the above data? (Select all correct answers.)
The alleles causing the raspberry-colored eye and sable-colored body phenotypes are dominant to the corresponding wild-type alleles
The genes controlling raspberry-colored eyes and sable-colored bodies map…
Chapter 21 Solutions
Genetics: From Genes to Genomes
Ch. 21 - Choose the best matching phrase in the right...Ch. 21 - When an allele is dominant, why does it not always...Ch. 21 - A population with an allele frequency p of 0.5 and...Ch. 21 - In a certain population of frogs, 120 are green,...Ch. 21 - Which of the following populations are at...Ch. 21 - A dominant mutation in Drosophila called Delta...Ch. 21 - A large, random mating population is started with...Ch. 21 - Prob. 8PCh. 21 - Alkaptonuria is a recessive autosomal genetic...Ch. 21 - Two hypothetical lizard populations found on...
Ch. 21 - It is the year 1998, and the men and women sailors...Ch. 21 - a. Alleles of genes on the X chromosome can also...Ch. 21 - In 1927, the ophthalmologist George Waaler tested...Ch. 21 - The equation p2 2pq q2> = 1 representing the...Ch. 21 - A gene has two alleles A frequency = p and a...Ch. 21 - Some people can taste the bitter compound...Ch. 21 - Androgenetic alopecia pattern baldness is a...Ch. 21 - The following figure shows the FBI-style analysis...Ch. 21 - Why is the elimination of a fully recessive...Ch. 21 - Tristan da Cunha is a group of small islands in...Ch. 21 - Small population size causes genetic drift because...Ch. 21 - Three basic predictions underlie genetic drift in...Ch. 21 - A mouse mutation with incomplete dominance t =...Ch. 21 - In Drosophila, the vestigial wings recessive...Ch. 21 - In a population of infinite size, three loci A, B,...Ch. 21 - You have identified an autosomal gene that...Ch. 21 - In Europe, the frequency of the CF allele causing...Ch. 21 - An allele of the G6PD gene acts in a recessive...Ch. 21 - Explain why evolutionary biologists monitor...Ch. 21 - Tiny foxes live on the Channel Islands off the...Ch. 21 - What is the most straightforward evidence at the...Ch. 21 - In March 2013, the American Journal of Human...Ch. 21 - If you go back 40 generations into your biological...Ch. 21 - In Fig. 21.17, to what part of the world does...Ch. 21 - Predict the DNA sequences at the four nodes...Ch. 21 - A cladogram not drawn to scale for the taxonomic...Ch. 21 - As noted in Fig. 21.22, humans now living in...Ch. 21 - As of this writing in 2016, no Neanderthal-derived...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
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- In Drosophila, females heterozygous for the recessive alleles c, d, and e were crossed to males homozygous recessive for these three mutant genes. The phenotypes of the resulting progeny were: cd+ 350 ++e 350 c + e 51 + d + 49 c + + 100 + d e 100 _________ _____ Total progeny 1000 How were the three pairs of alleles arranged in the heterozygous females? a. +d+/c+e B. cde/+++ C. +de/c++ D. cd+/++earrow_forwardIn Drosophila, the vermilion eye color is determined by a recessive allele, v, of an X-linked gene. The wildtype color is determined by the v+ allele and causes a brick red eye color. In a cross of a heterozygous female with a wild type male you observe 340 red eye females, 136 red eye males, and 90 vermillion males. Do these results follow your expectations?arrow_forwardThe allele b gives Drosophila flies a black body and b+ gives brown, the wild-type phenotype. The allele wx of a separate gene gives waxy wings and wx+ gives non-waxy, the wild-type phenotype. The allele cn of a third gene gives cinnabar eyes and cn+ gives red, the wild-type phenotype. A female heterozygous for these three genes is testcrossed, and 1000 progeny are classified with the following phenotypes. 382 cinnabar 379 black, waxy 69 waxy, cinnabar 67 black 48 waxy 44 black, cinnabar 5 wild type 6 black, waxy, cinnabar Based on this data, what is the correct map of these genes in terms of order and distance?arrow_forward
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