An individual with genotype AaBbCCDdEE can make many kinds of gametes. Which of the following correctly describes why this situation is possible? 4) recurrent mutations form new alleles 3) crossing over during prophase I leads to genetic variety ) different possible assortment of chromosomes/alleles into gametes occurs ) there is a tendency for dominant alleles to segregate together
An individual with genotype AaBbCCDdEE can make many kinds of gametes. Which of the following correctly describes why this situation is possible? 4) recurrent mutations form new alleles 3) crossing over during prophase I leads to genetic variety ) different possible assortment of chromosomes/alleles into gametes occurs ) there is a tendency for dominant alleles to segregate together
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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Transcribed Image Text:**Genetic Variation in Gametes: Understanding Allelic Segregation**
**Context:**
An individual with the genotype AaBbCcDdEe can produce many kinds of gametes. Understanding this phenomenon is crucial to studying genetic variation.
**Explanation:**
The question explores why an organism with the genotype AaBbCcDdEe can generate diverse gametes. Here's a breakdown of possible explanations:
A) **Mutations and New Alleles:** The role of recent mutations in forming new alleles is considered, although this isn't the primary mechanism for gametic diversity in this context.
B) **Crossing Over and Genetic Variety:** During prophase I of meiosis, crossing over leads to genetic variety. This process is essential as homologous chromosomes exchange genetic material, thus producing unique combinations of alleles in gametes.
C) **Independent Assortment:** Independent assortment of chromosomes during meiosis allows for genetic variety. Each pair of alleles segregates independently from others, leading to multiple possible combinations in gametes.
D) **Dominant Alleles and Segregation:** A less likely explanation, it considers the tendency of dominant alleles to segregate together, although this does not primarily contribute to generating different gametes.
By understanding these principles, students can grasp how genetic diversity arises, contributing to evolutionary processes and biological diversity.
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