Campbell Essential Biology (7th Edition)
7th Edition
ISBN: 9780134765037
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 9, Problem 22PS
Interpreting Data As shown in the Punnett square below, albinism is caused by an autosomal recessive allele. Two parents who do not show any signs of albinism but are carriers could therefore have a child who displays albinism because that child could inherit one recessive albinism causing gene from each parent. Imagine that a male with albinism mates with a female who does not display albinism. We know the male with albinism must have the genotype aa, but the female could be either Aa or AA. Such a mating is essentially a testcross, like the one shown in Figure 910. If the parents' first child does not display albinism, can you say with certainty what the mother’s genotype must be? What if the couple has four children (none twins), none displaying albinism–can you say with certainty the mother's genotype? What would it take for a definitive genotype to be assigned?
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Assume that long ear lobes phenotype in humans is an autosomal dominant trait that
exhibits 10% penetrance. A person who is heterozygous for long ear lobes mates
with a person who is also heterozygous for long ear lobes. What is the probability that
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Both parents must be homozygous dominant.
Both parents must be heterozygous.
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One parent must be heterozygous; the other parent can be homozygous dominant, homozygous recessive, or heterozygous.
One parent must be homozygous for the recessive allele; the other parent can be homozygous dominant, homozygous recessive, or heterozygous.
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Consider a cross between a Brown furred dog and a Yellow furred dog. All the puppies born from these parents are yellow furred. Crossing the F1 yellow furred sons and F1 yellow furred daughters produces a 3:1 ratio of yellow furred dogs (3) to brown-furred dogs (1) in the F2 generation.
True or False: this tells you that brown fur color in this dog species is inherited in an autosomal recessive manner.
is it true or false?
Chapter 9 Solutions
Campbell Essential Biology (7th Edition)
Ch. 9 - The genetic makeup of an organism is called its...Ch. 9 - Which of Mendels laws is represented by each...Ch. 9 - Edward was found to be heterozygous (Ss) for the...Ch. 9 - Whether an allele is dominant or recessive depends...Ch. 9 - Prob. 5SQCh. 9 - Prob. 6SQCh. 9 - Prob. 7SQCh. 9 - Prob. 8SQCh. 9 - Adult height in people is at least partially...Ch. 9 - A purebred brown mouse is repeatedly mated with a...
Ch. 9 - How could you determine the genotype of one of the...Ch. 9 - Tim and Jan have freckles (a dominant trait), but...Ch. 9 - Incomplete dominance is seen in the inheritance of...Ch. 9 - Why was Henry VIII wrong to blame his wives for...Ch. 9 - Both parents of a boy arc phenotypically normal,...Ch. 9 - Heather was surprised to discover that she...Ch. 9 - Prob. 17SQCh. 9 - Prob. 18IMTCh. 9 - Prob. 19IMTCh. 9 - For each pair of your homologous chromosomes, one...Ch. 9 - In 1981, a stray cat with unusual curled-back ears...Ch. 9 - Interpreting Data As shown in the Punnett square...Ch. 9 - There are now nearly 200 recognized breeds of dog,...Ch. 9 - Gregor Mendel never saw a gene, yet he concluded...Ch. 9 - Prob. 25BS
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