Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question

Transcribed Image Text:**Probability of Maternal Chromosomes in Gametes**
A short-tailed weasel contains a total of 6 chromosomes in its somatic cells. Assuming that crossing over does not occur, what is the probability that a gamete will only contain chromosomes of maternal origin?
- **Selected Answer:**
a. ❌ 1/6
- **Correct Answer:**
b. ✔️ 1/8
**Explanation:**
In this scenario, each gamete contains half of the organism’s chromosomes after meiosis. For a somatic cell with 6 chromosomes, there are 3 pairs of homologous chromosomes. Without crossing over, the probability that a gamete will receive only maternal chromosomes follows the formula (1/2)^n, where n is the number of pairs. Therefore, (1/2)^3 = 1/8, making 1/8 the correct probability.
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