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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Suppose that round ears in guinea pigs is a recessive phenotype. You have just adopted a guinea pig with pointy ears. Using crosses, how can you determine whether this guinea pig with pointy ears is homozygous or heterozygous for the dominant trait? Explain the cross you would make and what it would tell you.
Are these alleles common or rare in humans? Answer this question in not more than 3 sentences.
Use the pedigree to answer the question.
How is this trait inherited?
A. The trait is epistatic.
B. The trait is X-linked.
C. The trait is dominant.
D. The trait is recessive.
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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- Which phenomenon explains differences in the inheritance patterns of the appearance of a chin beard between males and females of certain species of goats, even when their genotypes are the same? A) sex-limited trait B) sex-influenced trait C) incomplete penetrance D) variable expressivity E) lethal allelearrow_forwardyou perform a cross of two heterozygous, red-eyed flies. They have 100 offspring. How many of these offspring do you predict will have red eyes? Show your work using a Punnett square. [Use letters R and r to designate the alleles]arrow_forwardBased on your understanding of sex - linked recessive traits, would it be possible for the phenotype to skip one or more generations before reappearing? Explain your answer.arrow_forward
- Give written answer with explanation and conclusion A cross was made between a white male dog and two different black females. The first female gave birth to eight black pups, and the second female gave birth to four white and three black pups. What are the likely genotypes of the male parent and the two female parents? Use Punnett’s squares to support your answer. Explain whether you are uncertain about any of the genotypes.arrow_forwardYou carry two alleles for every trait. Where did these traits come from?arrow_forwardwhen else do we see a non-Mendelian pattern of inheritance? a)When genes are located on different chromosomes b)When genes are located far away on the same chromosome c)When genes are located close together on the same chromosomearrow_forward
- Use a Punnet Square to answer the question below. If the dad is heterozygous for freckles and the mom is homozygous for no freckles, what is the probability that they will have children with freckles or no freckles?arrow_forwardIf someone did have the same phenotype, would they necessarily have the same genotype? Why?arrow_forwardRed hair is recessive to dark hair. If red-headed Jack fathers a child with red-headed Lisa, what are the chances that their children will have red hair? Show you work using a Punnett square.arrow_forward
- The relationship between genotype and phenotype. Explain this relationship.arrow_forwardCurly hair is recessive, and straight hair is dominant. A woman with curly hair marries a man who is homozygous dominant for straight hair. Use the picture to answer.arrow_forwardWhy is there no trait (letter) on the y chromosome for males in this pedigree? A. Because the trait is X-linked (on the X chromosome) B. Because Ms. Premo made a mistake C. Because we never write anything on the y chromosomearrow_forward
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