Genetic Analysis: An Integrated Approach (3rd Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 18, Problem 12P
Summary Introduction

To analyze:

In case of mammals, identical twins arise when an embryo is results from a single fertilized egg which divides into two independent embryos, leads to the production of two genetically identical individuals. Based on this information, the question is asked

When can this occur from a genetic view point.

Describe the genetic implications when two genetically distinct embryos are fused in a single individual.

Introduction:

From a genetic viewpoint, twins are two offsprings that are produced by the same pregnancy. According to zygosity, there are two types of twins-monozygotic or dizygotic. Monozygotic twins are developed from one embryo in which one embryo splits into two embryos, whereas dizygotic twins are developed from two different eggs that are fertilized by separate sperms.

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In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal  phenotype wherein homozygous (m-m-) females produce eggs that cannot support embryonic development. Homozygous (m-m-) males, however, can still produce viable sperm. Using m+ to denote a normal gene, determine the genotypes and phenotypes of the F1s produce by a cross between a heterozygous female and  a recessive male. From the offspring, backcross the recessive female with the paternal strain. What are the genotypes and phenotypes of the F2s? Show COMPLETE cross for both cases.   If m-m- females produce useless eggs, then how are m-m- produced?
In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormalphenotype wherein homozygous (m-m-) females produce eggs that cannot support embryonicdevelopment. Homozygous (m-m-) males, however, can still produce viable sperm. Using m+ todenote a normal gene, determine the genotypes and phenotypes of the F1s produce by a crossbetween a heterozygous female and a recessive male. From the offspring, backcross the recessivefemale with the paternal strain. What are the genotypes and phenotypes of the F2s?

Chapter 18 Solutions

Genetic Analysis: An Integrated Approach (3rd Edition)

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