EBK HUMAN BIOLOGY
11th Edition
ISBN: 9780100545939
Author: MCMILLAN
Publisher: YUZU
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Chapter 19, Problem 4CT
The young woman shown at right has albinism—very pale skin, white hair, and pale blue eyes. This phenotype is due to the absence of melanin, which imparts color to the skin, hair, and eyes. It typically is caused by a recessive allele. In the following situations, what are the probable genotypes of the father, the mother, and their children?
- a. Both parents have normal
phenotypes ; some of their children are albino and others are not. - b. Both parents and all their children are albino.
- c. The mother is not albino, the father is albino, and one of their four children is albino.
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A homozygous recessive allele, aa, is responsible for albinism. Humans can exhibit this phenotype. In each
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(b) Both parents are albino and have only albino children:
(c) The woman is unaffected, the man is albino, and they have one albino child and three unaffected children:
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The allele for albinism is recessive to the allele for normal skin pigmentation. All individuals who are homozygous for this recessive allele (m) are unable to produce the enzyme needed for melanin production and are referred to as albinos. In the following statements, determine the correct genotypes: An albino male (genotype A) whose parents both have normal skin pigmentation (genotype B) marries a woman who does not have albinism (genotype C). This woman’s father is an albino (genotype D). The married couple has three children, two with normal skin pigmentation (genotype E) and one exhibiting albinism (genotype F)
Albinism causes the skin, hair, or eyes to have little or no color. It is also associated with vision problems. Albinism results from an allele a that is recessive to the allele for normal melanin production. Maya has normal skin color, but her sister has albinism. Maya’s mother has albinism, and her father has normal skin color.
a)What are the genotypes of Maya, her sister, her mother, and her father.
b)If Maya’s parents have another child, what is the probability that this child will have albinism? Show the Punnett square you use to help in solving.
c)If Maya marries a man with albinism, what is the probability that their first child will have albinism? Show the Punnett square you use to help in solving.
Chapter 19 Solutions
EBK HUMAN BIOLOGY
Ch. 19 - Define the difference between (a) gene and allele,...Ch. 19 - Prob. 2RQCh. 19 - What is probability, and how is it applied in...Ch. 19 - What is independent assortment? Does independent...Ch. 19 - Alleles are ___________. a. alternate forms of a...Ch. 19 - A heterozygote has _____. a. only one of the...Ch. 19 - Prob. 3SQCh. 19 - Offspring of a cross AA aa are ______. a. all AA...Ch. 19 - Prob. 5SQCh. 19 - Prob. 6SQ
Ch. 19 - Which statement best fits the principle of...Ch. 19 - Prob. 8SQCh. 19 - Prob. 9SQCh. 19 - Prob. 10SQCh. 19 - One gene has alleles A and a. Another has alleles...Ch. 19 - Still referring to Problem 1, what will be the...Ch. 19 - Go back to Problem 1, and assume you now study a...Ch. 19 - The young woman shown at right has albinismvery...Ch. 19 - When you decide to breed your Labrador retriever...Ch. 19 - The ABO blood system has been used to settle cases...Ch. 19 - Prob. 7CTCh. 19 - A man is homozygous dominant for ten different...Ch. 19 - Prob. 9CTCh. 19 - Bill and Marie each have flat feet, long...Ch. 19 - You decide to breed a pair of guinea pigs, one...
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