Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 29.3, Problem 1R
Summary Introduction
To review:
Mating types in fungi and how they are different from male and female sexes.
Introduction:
Mating in fungi is a complex process based on mating types. Many species do not reproduce sexually and the ones, which do have isogamous gametes. This makes it difficult to classify a
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Chapter 29 Solutions
Life: The Science of Biology
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- Direction: Solve the problem using a Punnett square. In fruit flies, humans and other mammals, sex is determined by an X-Y system However, many organisms do not have the X Y system of sex determination. For example, birds have a Z - W system Male birds are ZZ whereas females are ZW. In chickens, barred feathers (Z) are dominant over nonbarred feathers (Zb). a. Draw a Punnett square that shows the results of a cross between a barred female and a nonbarred male. b. What is the probability that the offspring will be: i. Barred females? ii. Nonbarred females? iii. Barred males? iv. Nonbarred males?,arrow_forwardAfter five generations of random mating, what is the frequency of the a allele?arrow_forwardIn rabbits, the gene that codes for a spotted coat is dominant over the gene that codes for a solid coat, and the gene for the coat's black color is dominant over the gene for the coat's brown color. If a spotted, black-coated rabbit mates with a solid, brown-coated rabbit, what are the genotypes and phenotypes of their offspring?arrow_forward
- A sex-linked dominant gene, barred (feather pattern) can be used to sex newly hatched chicks. If abarred hen is mated to non-barred rooster, what are the phenotypes of the males and female chicks?arrow_forwardSalamanders have a male heterogametic system for sex determinations where females are ZZ and males are ZW. The allele for the color of the tail is sex linked and the red allele is found on the W chromosome and the blue allele is found on the Z chromosome. You mate a male and female and they have 3 female offspring. What is the phenotypic ratio for tail color for their offspring? Group of answer choices 2 Blue : 1 Red 0 Blue : 3 Red 1 Blue : 2 red 3 Blue : 0 Redarrow_forwardList and briefly describe the three processes that lead to variation in offspring with the same parents.arrow_forward
- Is the interspecific breeding possible?arrow_forwardA yellow female Labrador retriever was mated with a brown male. Half of the puppies were brown, and half were yellow. Explain how the same female, when mated with a different brown male, could produce only brown offspring. The first male was bb EE, and the second male was bb Ee. The first male was Bb EE, and the second male was Bb Ee. The first male was bb Ee, and the second male was bb EE. The first male was bb Ee, and the second male was Bb Ee. The first male was bb Ee, and the second male was bb ee.arrow_forwardExplain The mating of parents with antagonistic traits produces hybrids?arrow_forward
- On average, when two people who are heterozygous for brown eyes mate, their children will be Group of answer choices all brown-eyed all blue-eyd 75% brown eyes, 25% blue eyes 25% brown eyes, 75% blue eyes 50% brown-eyed, 50% blue-eydarrow_forwardlist and briefly describe the three process that lead to variation in offspring with the same parents.arrow_forwardRead in your textbook about positive assortative mating. In this example, from your text, positive assortative mating is 100% (i.e. there is no random mating). Note that the frequency of heterozygotes is cut in half each generation. Does this match your answers above? Look at the actual values make sure you understand why positive assortative mating leads to an increase in homozygosity. (a) Only heterozygotes produce heterozygote offspring, but only 50% of the time Homozygote parent for A, Heterozygote parent Homozygote parent for A, Eggs A, A, Eggs A2 A, Eggs A2 A2 A, A, A, A, A, A, A, A, A, A2 A2 A2 A2 A2 A2 A, A, A, A, A, A, A, A2 A2 A2 A2 A2 Az A2 A2 (b) Effect of extreme inbreeding (self- fertilization) over time A, A, Homozygote A, A2 Heterozygote A2 A2 Homozygote The arrows represent A, p= 0.5 offspring genotypes that are produced by each parental genotype Generation 1 Az q = 0.5 100% 25% 50% 25% 100% A, p= 0.5 Az q= 0.5 Generation 2 100% 25% 50% 25% 100% The frequencies of…arrow_forward
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