Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 20, Problem 4CT
Summary Introduction
To explain: Whether a trait that appears in males only provided good evidence that it is caused by Y-linked allele.
Introduction: Y-linked traits denote that a gene for a particular trait is located on the Y-chromosome. Sex influences traits denote that a gene for a particular trait is located on autosome but is influenced by the sex of that individual.
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Color blindness is caused by an X-linked recessive allele that is rare in humans. Suppose two parents have normal color vision and color-blind fathers. What is the chance that their second son will have normal vision?.
Hemophilia is a disease caused by a gene found on the X chromosome. Therefore, it is a sex-linked disease which is caused by the recessive allele. Suppose, a man with hemophilia marries a woman who is homozygous dominant for the trait. Predict the genotype of the man. (XH = normal; Xh= hemophiliac) *
a. XH Y
b. XHXh
c. XhXh
d. Xh Y
Could a woman with the X-linked color-blind trait have a son without colorblindness? Use a Punnett square to explain your answer.
Chapter 20 Solutions
Human Biology (MindTap Course List)
Ch. 20 - Prob. 1RQCh. 20 - What is a carrier of a genetic trait?Ch. 20 - What evidence indicates that a trait is coded by a...Ch. 20 - Prob. 4RQCh. 20 - Explain what nondisjunction is, and give two...Ch. 20 - _______ segregate during ______. a. Homologues;...Ch. 20 - Prob. 2SQCh. 20 - Genes on the same chromosome tend to stay together...Ch. 20 - Prob. 4SQCh. 20 - A chromosomes structure can be altered by _______....
Ch. 20 - Nondisjunction can be caused by ________. a....Ch. 20 - A gamete affected by nondisjunction could have...Ch. 20 - Genetic disorders can be caused by __________. a....Ch. 20 - A person who is a carrier for a genetic trait...Ch. 20 - Prob. 10SQCh. 20 - If a couple has six boys, what is the probability...Ch. 20 - Human sex chromosomes are XX for females and XY...Ch. 20 - People with Down syndrome have an extra copy of...Ch. 20 - Prob. 4CTCh. 20 - Prob. 5CTCh. 20 - About 4 percent of people of Northern European...Ch. 20 - The following pedigree shows the pattern of...
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- Imagine a cross between a man and a woman having the following genotypes: Genotype of the Husband Genotype of the Wife Aa bb Dd Gg Hh RR Tt X Aa Bb Dd gg Hh Rr Tt Suppose, that the A allele exhibited incomplete dominance over the a allele and the T allele exhibited incomplete dominance over the t allele. In that instance, how many different phenotypes would be possible among the offspring of this same couple?arrow_forwardPlease explain why sex linked recessive traits are inherited by the son from his mother. If a mother is a carrier, what percentage of her sons will have the trait? Please give me example of sex linked recessive trait.arrow_forwardDoing genetic analysis it is determined that two parents are heterozygous for two separate unlinked recessive traits (i.e., both parents are heterozygous for both loci). Given this genetic information, what is the probability of their having a child which is homozygous recessive for both traits?arrow_forward
- Given that the gene for the color-blind condition is recessive and X-linked. You have a female with Turner Syndrome, with their paternal parent that is color-blind. Which of these statements BEST explains this scenario.arrow_forwardHemophilia is a disease caused by a gene found on the X chromosome. Therefore, it is a sex-linked disease which is caused by the recessive allele. Suppose, a man with hemophilia marries a woman who is homozygous dominant for the trait, what is the chance of having children who are hemophiliacs? (XH = normal; Xh= hemophiliac) * a. 0% b. 75% c. 100% d. 25%arrow_forwardIn certain species of flies, eye color is controlled by sim-·ple dominance by a single pair of alleles. A red-eyed fly was crossed with a white-eyed fly, both of whose parents had white eyes. All of their offspring (both female and male) had red eyes.a. Which is dominant, the allele for red eyesor the allele for white eyes?b. What is the genotype of the white-eyed parents?c. If the white-eyed parent was mated with one of the red-eyed offspring, what phenotypic ratio wouldyou expect regarding eye color?arrow_forward
- Do a little research about Tay Sachs disease. Briefly explain why the Mendelian inheritance does not apply to the inheritance of alleles in individuals with Tay Sachs disease.arrow_forwardA tortoiseshell cat, such as the cat pictured, is likely to be female. Why do tortoiseshell coats occur primarily in female cats? Testosterone suppresses the tortoiseshell gene in males, so tortoiseshell coats appear more often in females, who have less testosterone than males. Tortoiseshell coloring is an X-linked recessive trait, so females with two X chromosomes are more likely to express the trait than males. One of a female's two X chromosomes is randomly inactivated in each cell, so each cell may express different alleles. O The X chromosome is disabled in males, so a tortoiseshell coat, which is an X-linked recessive trait, does not occur in males.arrow_forwardIn humans, color blindness is a sex-linked recessive trait. A female who is a carrier (XBXb) for color blindness has children with a male with normal vision (XBY). Make a Punnett Square to help you answer the questions. What are the chances of their children being color blind? What are the chances of their children being ‘carriers’ for color blindness?arrow_forward
- in humans brown eyes (B) are dominant over blue (b).A brown eye man marries a blue-eyed woman and they have three children , two of whom are brown eyed and one of whom is blue eyed.Draw the punnett square that illustrate this marrage.what is the man's genotype ? what are the genotype of the children?arrow_forwardUse a punnett square in fruit flies, red eyes (r) are dominant to pink eyes (r). what is the phenotypic ratio of a cross between a heterozygous male and a pink-eyed femalearrow_forwardThis is all about sex linked inheritance in biology.arrow_forward
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