Nondisjunction and chromosomal disorders Knowledge-Based Practice

Questions

1. 1.

   Which of the following describes the chromosomal distribution in the four gametes produced when nondisjunction of a single homologous pair occurs during meiosis I?

   • A) All four resulting gametes contain the normal haploid number of chromosomes ($n$).
   • B) Two gametes contain an extra chromosome ($n + 1$) and two gametes lack a chromosome ($n - 1$).
   • C) Two gametes are normal ($n$), one gamete has an extra chromosome ($n + 1$), and one lacks a chromosome ($n - 1$).
   • D) All four gametes fail cytokinesis and retain the full diploid chromosome set ($2n$).

Answers and step-by-step solutions appear after you finish the test.