Human Biology: Concepts and Current Issues
Human Biology: Concepts and Current Issues
7th Edition
ISBN: 9780321821652
Author: Michael D. Johnson
Publisher: Benjamin Cummings
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Chapter 19, Problem 2TY
Summary Introduction

Introduction:

Gametes are haploid cells involved in sexual reproduction. They are formed by the process of cell division or meiosis. A gamete from the father and another gamete from the mother, fuse to form a zygote.

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Organism X has the genotype Ccdd. How many different types of gametes can it make and in what proportion? * A. 3 Cd 1 cd B. 1 CD: 1 Cd : 1 cD 1 cd C. 1 Cc : 1 dd D. 1 Cd 1 cd A human female "carrier" who is heterozygous for the recessive, sex-linked trait hemophilia (XHXH), marries a normal male (XHY). What proportion of their male progeny will show the trait? A. 1/4 B. 1/2 C. 0 D. All
How many different combinations of maternal and paternal chromosomes can be packaged in gametes made by an organism with a diploid number of 8 (2n=8)?   a. 32   b. 16   c. 2   d. 4
The beautiful red postman butterfly (Heliconius erato), shown below, has 21 pairs of homologous chromosomes (2N=42). If a red postman is heterozygous for just 4 genes on every chromosome, how many unique genotypes are possible in its gametes? a.2 b.4 c.221 d.242 e. 284
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