Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 16, Problem 9LTB
Summary Introduction
Introduction:
Small populations can work distinctly in comparison to larger populations. They are usually the outcome of a population bottleneck from larger populations, resulting in a reduced genetic diversity and loss of heterozygosity, and shifts in allele frequencies, and loss or fixation of alleles.
A small population is more vulnerable to genetic and demographic stochastic events that can influence the long-term survival of the population. Thus, small populations are generally at the threat of endangerment or extinction. Hence, their conservation becomes a priority concern.
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The frequency of the homozygous recessive
genotype of a given gene in a given population is
0.04. The frequency of the dominant allele in this
population is
Between Ithaca and Geneva, NY at the old Seneca Army Depot is a herd of white tailed deer (Odocoileus virginianus). The species is normally brown. The Army Depot is closed, but offers tours to see the deer herds. There are 800 deer in the population, 160 of which are white (yy). Typically expression of this recessive allele makes the individuals more susceptible to predation, but the Army Depot is fenced off, providing protection from most predators. These brown-eyed deer are not albinos, but rather leucistic (lacking pigmentation in their hair only). Management of the Seneca white deer on the Army Depot increased the proportion of deer exhibiting the trait.
a) What is the frequency of the recessive (white) allele in the population?
b) What is the predicted frequency of carriers of the leucistic trait in the population.
1A) When you have extreme inbreeding (i.e. same genotypes mate to give rise to the next generation), the percent of heterozygotes will decrease by ________ % a generation, whereas the percent of AA homozygotes will increase ________ % each generation and the percent of aa homozygotes will increase ________ % each generation .
60, 40, 0
none
50, 25, 25
50, 10, 40
25, 50, 25
1B) What is the one measurement we have to make if we want to know the percentage of particular genotypes within an actual population, assuming complete dominance and two alleles?
the frequency of dominant phenotypes
the frequency of heterozygous genotypes
the frequency of recessive phenotypes
all of the options are correct
the frequency of heterozygous phenotypes
Chapter 16 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 16 - Prob. 1LTBCh. 16 - Compare and contrast the species interactions of...Ch. 16 - Prob. 3LTBCh. 16 - Current rates of species extinction appear to be...Ch. 16 - According to the generalized species-area curve,...Ch. 16 - Prob. 6LTBCh. 16 - Prob. 7LTBCh. 16 - Which of the following is an example of a...Ch. 16 - Prob. 9LTBCh. 16 - Prob. 10LTB
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