Essential Cell Biology
Essential Cell Biology
4th Edition
ISBN: 9780815344544
Author: Keith Roberts, Karen Hopkin, Alexander D Johnson, Martin Raff, Dennis Bray, Bruce Alberts, Julian Lewis, Peter Walter
Publisher: TAYLOR
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Chapter 19, Problem 2Q

(A)

Summary Introduction

To explain: The number of possibilities that can be sampled in the average life span of a female.

Concept introduction: Human contains 23 dissimilar chromosomes. By excluding the chromosome cross-over, a human can produce 223=8.4 X 106 genetically dissimilar gametes. Crossing over involves the exchange of genetic material between two homologous chromosomes that take place during the pachytene stage of meiosis I. This crossing over can produce variation. Hence, meiosis can occur by ignoring the effects of crossing over.

(B)

Summary Introduction

To explain: The number of possibilities that can be sampled in the average life span of a male.

Concept introduction: Human contains 23 dissimilar chromosomes. By excluding the chromosome cross-over, a human can produce 223=8.4 X 106 genetically dissimilar gametes. Crossing over involves the exchange of genetic material between two homologous chromosomes that take place during the pachytene stage of meiosis I. This crossing over can produce variation. Hence, meiosis can occur by ignoring the effects of crossing over.

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