Homework Help is Here – Start Your Trial Now!
Science
Biology
I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful! Sometimes nondisjunction will occur in a parent that has normal chromosome numbers and result in an offspring that has abnormal

I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful! Sometimes nondisjunction will occur in a parent that has normal chromosome numbers and result in an offspring that has abnormal

Human Physiology: From Cells to Systems (MindTap Course List)
Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter20: The Reproductive System
Section: Chapter Questions
Problem 11RE
See similar textbooks
icon
Related questions
Question

Hi, I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful!

  1. Sometimes nondisjunction will occur in a parent that has normal chromosome numbers and result in an offspring that has abnormal number of chromosomes. The phenotype of the affected offspring will often allow geneticists to determine in which parent and during which division of meiosis the nondisjunction occurred. In each of the examples below, assume the parents have a normal diploid chromosome complement.

EXAMPLE 1: A man with the X-linked dominant condition “brown tooth enamel” and a woman with normal tooth enamel produce a son with brown tooth enamel. Let’s call the allele for brown tooth enamel “XB” and normal tooth enamel “Xb”.

  1. In which parent did the nondisjunction occur? Explain and/or illustrate
  2. Did nondisjunction occur at meiosis I or II? Explain and/or illustrate.
  3. What sex chromosomes are in the child’s somatic cells?

EXAMPLE 2: The parents in the family above produce another son, this time with two Y chromosomes and normal tooth enamel.

  1. In which parent did the nondisjunction occur? Explain and/or illustrate.
  2. Did nondisjunction occur at meiosis I or II? Explain and/or illustrate.
  3. What sex chromosomes are in the child’s somatic cells?

 

Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Human Physiology: From Cells to Systems (MindTap …
Human Physiology: From Cells to Systems (MindTap …
Biology
ISBN:
9781285866932
Author:
Lauralee Sherwood
Publisher:
Cengage Learning
Human Heredity: Principles and Issues (MindTap Co…
Human Heredity: Principles and Issues (MindTap Co…
Biology
ISBN:
9781305251052
Author:
Michael Cummings
Publisher:
Cengage Learning
Biology 2e
Biology 2e
Biology
ISBN:
9781947172517
Author:
Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:
OpenStax
Biology Today and Tomorrow without Physiology (Mi…
Biology Today and Tomorrow without Physiology (Mi…
Biology
ISBN:
9781305117396
Author:
Cecie Starr, Christine Evers, Lisa Starr
Publisher:
Cengage Learning
Human Biology (MindTap Course List)
Human Biology (MindTap Course List)
Biology
ISBN:
9781305112100
Author:
Cecie Starr, Beverly McMillan
Publisher:
Cengage Learning
SEE MORE TEXTBOOKS