Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 10.2, Problem 1CSC
Summary Introduction

To determine: Whether the process of gamete formation and union can explain the full range of diverse traits exhibited by the children of the given parents.

Introduction: The male and female gametes are formed by meiosis, which is a reduction division resulting in haploid gametes from diploid germ cells. During sexual reproduction, the haploid male and female gametes combine to a diploid zygote.

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In fruit flies, eye color is carried on the X chromosome. The allele for red eyes is dominant over its recessive allele, white eyes.     -Cross a heterozygous female to a white-eyed male 1st Question to answer ---- How many genotypes are possible among the offspring? 2nd Question to answer ---- How many phenotypes are possible among the offspring? 3rd Question to answer ---- What is the probability of getting a red-eyed male? 4th Question to answer ---- What is the probability of getting a white-eyed male? 5th Question to answer ---- What is the probability of getting a red-eyed female? 6th Question to answer ---- What is the probability of getting a white-eyed female? 7th Question to answer ---- What is the probability of getting a red-eyed offspring? 8th Question to answer ---- What is the probability of getting a white-eyed offspring?
Parents pass chromosomes in gametes to form the zygote, which will grow and develop to become an adult. But in the gametes of the adult, each chromosome will be a mix of mothers and father genes, not exclusively mother’s or father’s, as they were in the zygote. Why is this?
Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a second sex chromosome. Can Turner syndrome be due to nondisjunction during oogenesis, spermatogenesis, or both? If a phenotypically normal couple has a color-blind child (due to a recessive X-linked allele) with Turner syndrome, did nondisjunction occur duringoogenesis or spermatogenesis in this child’s parents? Explain your answer.
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