EBK BIOLOGY
11th Edition
ISBN: 8220106820636
Author: Martin
Publisher: CENGAGE L
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Chapter 11, Problem 2TYU
The F1 flies described in question 1 were mated with brown-eyed flies from a true-breeding line. What
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In Drosophila, the X chromosomes may become attached to one another (XXn ) such that they always segregate together. Some flies thus contain a set of attached X chromosomes plus a Y chromosome. (a) What sex would such a fly be? Explain why this is so. (b) Given the answer to part (a), predict the sex of the off-spring that would occur in a cross between this fly and a normal one of the opposite sex. (c) If the offspring described in part (b) are allowed to interbreed, what will be the outcome?
Which of the following is least likely to produce genetic variation in the offspring of an individual?
(a) a DNA replication error caused by DNA polymerase in a body cell of the individual
(b) a cross over event during meiosis that creates a new combination of alleles in the gametes
(c) independent assortment of chromosomes during meiosis that creates a new combination of alleles in the gametes
(d) the random fertilization of an egg cell by a sperm cell during sexual reproduction
Two normal-looking fruit flies were
crossed and, in their progeny, there
were 202 females and 98 males. (i)
What is unusual about this result?
(ii) Provide a genetic explanation for
this anomaly. (iii) Provide a test of
your hypothesis.
Chapter 11 Solutions
EBK BIOLOGY
Ch. 11.1 - Define the terms phenotype, genotype, locus,...Ch. 11.1 - Describe Mendels principles of segregation and...Ch. 11.1 - Distinguish among monohybrid, dihybrid, and test...Ch. 11.1 - Explain Mendels principles of segregation and...Ch. 11.1 - What is the maximum number of different alleles...Ch. 11.1 - Can Mendels principle of segregation be...Ch. 11.1 - Prob. 3CCh. 11.2 - PREDICT Use the rules of probability to answer the...Ch. 11.2 - In answering the previous question, did you use...Ch. 11.3 - Define linkage and relate it to specific events in...
Ch. 11.3 - Show how data from a two-point test cross can be...Ch. 11.3 - Discuss the genetic determination of sex and the...Ch. 11.3 - What ratio of genotypes to phenotypes is observed...Ch. 11.3 - Prob. 2CCh. 11.3 - CONNECT Two loci exhibit 5% recombination between...Ch. 11.3 - Which chromosome determines the male sex in humans...Ch. 11.3 - Prob. 5CCh. 11.4 - Explain some of the ways genes may interact to...Ch. 11.4 - Distinguish among incomplete dominance,...Ch. 11.4 - Prob. 11LOCh. 11.4 - Prob. 1CCh. 11.4 - What is the difference between multiple alleles...Ch. 11.4 - Prob. 3CCh. 11.4 - Prob. 4CCh. 11 - One of the autosomal loci controlling eye color in...Ch. 11 - The F1 flies described in question 1 were mated...Ch. 11 - The type of cross described in question 2 is (a)...Ch. 11 - Individuals of genotype AaBb were crossed with...Ch. 11 - Assume that the ratio of females to males is 1:1....Ch. 11 - Redgreen color blindness is an X-linked recessive...Ch. 11 - When two long-winged flies were mated, the...Ch. 11 - The long hair of Persian cats is recessive to the...Ch. 11 - Mr. and Mrs. Smith are concerned because their own...Ch. 11 - A walnut comb rooster is mated to three hens. Hen...Ch. 11 - Individuals of genotype AaBb were mated to...Ch. 11 - Genes A and B are 6 map units apart, and A and C...Ch. 11 - VISUALIZE Sketch a series of diagrams showing each...Ch. 11 - Can you always ascertain an organisms genotype for...Ch. 11 - CONNECT Compare the mechanisms of genetic...Ch. 11 - EVOLUTION LINK Darwins theory of evolution by...Ch. 11 - INTERPRET DATA Using the graph in Figure 11-20,...
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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
- In Drosophila, an X-linked recessive mutation, scalloped (sd),causes irregular wing margins. Diagram the F1 and F2 resultsif (a) a scalloped female is crossed with a normal male; (b) ascalloped male is crossed with a normal female. Compare theseresults to those that would be obtained if the scalloped gene wereautosomal.arrow_forwardHere are schematic diagrams of mutant Drosophila larvae. The left side of each pair shows a wild-type larva, with gray boxes showing the sections that are missing in the mutant larva. Which type of gene is defective in each larva: a gap gene, a pair-rule gene, or a segment-polarity gene?arrow_forward20) When Thomas Hunt Morgan crossed his red-eved F1 generation flies to each other, the F2 generation included both red- and white-eyed flies. Remarkably, all the white-eyed flies were male. What was the explanation for this result? A) The gene involved is located on the Y chromosome. B) The gene involved is located on the X chromosome. C) The D) Other male-specific factors influence eye color in flies. gene involved is located on an autosome, but only in males.arrow_forward
- An insect species is discovered in which the heterogametic sex isunknown. An X-linked recessive mutation for reduced wing (rw)is discovered. Contrast the F1 and F2 generations from a crossbetween a female with reduced wings and a male with normalsizedwings when(a) the female is the heterogametic sex.(b) the male is the heterogametic sex.arrow_forwardIn a shocking discovery, biologists discover dragons! Dragon geneticists determine that flame eyes (F) are dominant to blue eyes (f) and burbling (B) is dominant to whistling (b). They suspect that the two genes are linked in one of the autosomes. They mate a true-breeding, flame-eyed, burbling female with a true-breeding, blue-eyed, whistling male. They then mate a pair of offspring. a) Assuming dragon genetics follows the same rules as fruit flies, what ratio of phenotypes would you expect in the F2 generation if the genes were not linked? (Remember you are crossing FfBb x FfBb). b) If the genes are linked, which of the F2 phenotypes would occur at a lower frequency than would be expected if the genes were not linked?arrow_forwardQuestion 9 Listen In fruit flies a dominant mutation on the X chromosome causes the eye to be oval instead of round. If a male with oval eyes has offspring with a female with round eyes, what percentage of the female offspring will have oval eyes? a) O b) 25 c) 50 d) 75 e) 100arrow_forward
- Has the DNA sequence of the eye color gene been changed in part (b) compared with part (a)? How do we explain the phenotypic difference?arrow_forwardDomesticated sheep cells have a total of 54 chromosomes (versus 46 chromosomes in human cells). (a) How many separate DNA molecules are present in a sheep liver cell at the end of the G1 phase? (b) How many separate DNA molecules are present in the daughter cells after meiosis I in the ovary of the sheep? (c) How many separate DNA molecules are present in the daughter cells after meiosis II in the ovary of the sheep?arrow_forwardIn fruit flies, normal wings (A) are dominant to dumpy wings (a) and the presence of eyes (B) is dominant to the absence of eyes (b). Create a dihybrid cross. what is the phenotype of each flyarrow_forward
- In fruit flies, eye color is an X-linked trait. Red eyes (XB) are dominant to maroon eyes (Xb). A male with red eyes mates with a female with maroon eyes. What will be the eye color of the flies in the F1 generation? A) Males: Maroon, Females: Red B) Males: Maroon, Females: Maroon C) Males: Red, Females: Maroon D) Males: Red, Females: Red E) Males: Maroon, Females: Red or Maroonarrow_forwardAssuming that such a fly would be viable, what would be the sex of a fruitfly (a) with one Xchromosome and 6 autosomes (b) three X chromosomes, one Y chromosome and 12autosomes? Show solutions.arrow_forwardSketch a series of diagrams showing each of the following, making sure to end each series with haploid cells:(a) How a pair of alleles for a single locus segregate in meiosis(b) How the alleles of two unlinked loci assort independently in meiosis(c) How the alleles of two linked loci undergo genetic recombinationarrow_forward
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