Human Biology (MindTap Course List)
11th Edition
ISBN: 9781305112100
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 20, Problem 1RQ
Summary Introduction
To differentiate: Between X and Y chromosomes.
Introduction: Chromosome is the condensed form of the genetic material DNA with histone, proteins, and centrosome. Chromosomes are of two types, namely autosomes and allosomes. Allosomes are the sex chromosomes that play the exclusive role of sex determination of the individual. The two sex chromosomes in humans are X and Y chromosomes.
Expert Solution & Answer
Explanation of Solution
The following table shows the difference between X and Y chromosomes:
| Criteria | X chromosome | Y chromosome |
| Number |
Occurs in pairs in females Single chromosome in males | Single chromosome in males |
| Genes | Genes for female sex determination | Genes for male sex determination |
| Size | Big | Small |
| Number of million base pairs | 155 | 59 |
| Percentage in genome | 5% of entire genome | 2% of entire genome |
| Number of genes | Approximately 1000 | Approximately 70 |
| Genotype | XX | XY |
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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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