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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How does sexual selection benefit the choices of mating between men and women?
In fruit flies and humans, sex is determined by an X-Y system. However, many organisms do not have the X-Y system of sex determination just like in birds. Instead, they have the Z-W system. Male birds are ZZ whereas, female birds are ZW. In chickens, barred feathers (ZB) are dominant over nonbarred feathers (Zb). If a barred female chicken mates a nonbarred male chicken, what is the probability of having barred female offspring?
50%
0%
25%
100%
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?,
Chapter 29 Solutions
Life: The Science of Biology
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- In some animal species, being tall is dominant over being short. If a homozygous dominant individual mates with a short individual, what is the chance that their offspring will be heterozygous?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
- How does density dependent affect intraspecific?arrow_forwardExplain The mating of parents with antagonistic traits produces hybrids?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_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_forwardwe discuss various mechanisms of sex determination, including the XX/XY system of placental mammals, and the ZZ/ZW system of birds. Monotremes, the most primitive mammals, have a very intriguing sex determination scheme that shares elements of both of these systems. Please use the internet to learn more about how sex in monotremes is determined. Then write a short essay (300-400 words) describing this system and comparing/contrasting it to the XX/XY and ZZ/ZW systems.arrow_forward
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