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Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
12th Edition
ISBN: 9780135755785
Author: Gerald Audesirk, Teresa Audesirk
Publisher: PEARSON+
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Question
Chapter 12.4, Problem 1TC
Summary Introduction
To determine: The outcome of natural selection on myostatin alleles.
Introduction: Myostatin, also known as growth differentiation factor 8 is a myokine protein that is released by myocytes. It has an autocrine function of inhibiting myogenesis, which is essential for muscle cell growth and differentiation. A mutation in the coding region of myostatin results in a double-muscle trait in cattle.
Summary Introduction
To explain: The outcome of natural selection on myostatin alleles.
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Students have asked these similar questions
Suppose a geneticist is using a three-point test cross to map three linked rabbit morphology and behavioral mutations called si,
It, and Le. The gene si is associated with the silky fur phenotype, and It is associated with the long-tailed phenotype. Both si and
It are recessive mutations with respect to wild type. Le is a dominant mutation that confers the lethargic phenotype.
The geneticist first crosses true-breeding lethargic rabbits to true-breeding silky fur, long-tailed rabbits. Next, the geneticist
backcrosses the Fj progeny to the silky fur, long-tailed parents, and obtains the results reported in the table.
Phenotype
Number
lethargic
815
silky fur, long-tailed
807
long-tailed
177
silky fur, lethargic
179
silky fur
7
long-tailed, lethargic
5
silky fur, long-tailed, lethargic
29
wild type
29
Place the genes in the correct order in the chromosome.
Answer Bank
si
It
Le
Spoink is a Pokemon character with a spring tail.
It must bounce continuously or it will die. Imagine that the spring in the tail is controlled by a single gene with two alleles T and t.
Individuals with the genotype TT have very stiff tails that take a lot of energy to bounce, Tt have just the right amount of spring, and those with tt tails have very floppy tails that deform after long periods of bouncing, making it very difficult to continue bouncing.
The genotype frequency in this population is:
TT=25%
Tt=70%
tt=5%
Part A:
The frequency of the t allele in the population is ___%.
The expected frequency of the Tt genotype in the population is ___%.
Part B:
Is the population of Spoink in Hardy-Weinberg Equilibrium?
A. Yes
B. No
Rationale?
Part C: What type of selection, if at all, might be operating on Spoink tails springy-ness?
A. Stabilizing Selection
B. Balancing Selection
C. Directional Selection
D. Disruptive Selection
E. No selection is occurring; population is in…
In griffins, coat colour is determined by a single gene with a completely dominant black (B) allele and a recessive white allele (b). Beak shape is determined by a single gene with a completely dominant sharp beak allele (R) and a recessive round beak allele (r). The colour and beak genes are linked by 25 cM(= centimorgans = map units). If a female heterozygous at both loci has the dominant alleles linked in cis, she will produce gametes that have what genotypes in what ratios? Explain your answer.
Chapter 12 Solutions
Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
Ch. 12.1 - Which do you think would be more difficult to...Ch. 12.1 - If viral genetic material had the same structure...Ch. 12.1 - Prob. 1CYLCh. 12.1 - Prob. 2CYLCh. 12.2 - Muscles, Mutations, and Myostatin The sequence of...Ch. 12.2 - Prob. 1CYLCh. 12.3 - describe the process of DNA replication, including...Ch. 12.3 - explain why DNA replication is called...Ch. 12.3 - Muscles, Mutations, and Myostatin "Double-muscled"...Ch. 12.4 - How Much Genes Influence Athletic Prowess?
Ch. 12.4 - explain what mutations are and how they occur?Ch. 12.4 - explain why mutations are rare?Ch. 12.4 - describe the different types of mutations?Ch. 12.4 - Prob. 1TCCh. 12 - If a parental DNA strand has the base sequence...Ch. 12 - Prob. 2MCCh. 12 - Prob. 3MCCh. 12 - The rungs of the DNA double helix consist of a....Ch. 12 - Prob. 5MCCh. 12 - Prob. 1FIBCh. 12 - Prob. 2FIBCh. 12 - Prob. 3FIBCh. 12 - Prob. 4FIBCh. 12 - Prob. 5FIBCh. 12 - Prob. 6FIBCh. 12 - Prob. 1RQCh. 12 - Prob. 2RQCh. 12 - Describe the structure of DNA. Where are the...Ch. 12 - Prob. 4RQCh. 12 - Describe the process of DNA replication.Ch. 12 - How do mutations occur? Describe the principal...Ch. 12 - Prob. 1ACCh. 12 - Genetic information is encoded in the sequence of...
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