Human Heredity: Principles and Issues (MindTap Course List)
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Chapter 5.5, Problem 1GR
Summary Introduction

To determine: The possibility of mutation in the pathway of folate synthesis to cause Spina bifida (SB) in the absence of folate-fortified foods.

Introduction: SB is a complex birth defect that involves neural tube (important for the brain and spinal cord development) defects in the individual. The affected individuals suffer from muscle imbalance, crippling deformities, and even paralysis in some cases. The defect is caused by the mutation in the gene VANGL1. A folate-rich diet reduces the severity of the defect and its incidence by 70%.

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Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…

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Human Heredity: Principles and Issues (MindTap Course List)

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