IA MODIFIED MASTERING BIOLOGY WITH E TEX
IA MODIFIED MASTERING BIOLOGY WITH E TEX
12th Edition
ISBN: 9780136781752
Author: Urry
Publisher: PEARSON
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Chapter 13, Problem 13.1CR

Explain why human offifuing resemble their parents but are not identical to them.

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Summary Introduction

To explain: Why human offspring are similar to their parents but they are not identical to them.

Introduction: Heredity is the process of the transmission of traits or heritable information to the next generation in the form of DNA. Humans reproduce sexually. During sexual reproduction, the genetic information from both the parents gives a unique gene combination in the offspring. The offspring resemble their parents but are somewhat different in their genetic makeup, which explains the genetic variation.

Explanation of Solution

Humans undergo sexual reproduction and inherit one chromosome of each homologous pair of chromosomes from each parent. Each somatic cell in humans consists of 46 chromosomes, which are two sets of 23 chromosomes each (maternal and paternal set).

During sexual reproduction, most of the variation arises during fertilization and meiosis. During meiosis, the homologous chromosomes randomly align with their homologs at metaphase I. According to the law of independent assortment of chromosomes, each daughter cell shows either maternal or paternal chromosome combinations. Thus, there is a 50% chance that the offspring gets maternal or paternal chromosomes or a combination of both. Secondly, crossing over forms the recombinant chromosomes that consist of a unique combination of genes in the offspring. The next aspect is random fertilization, which could be between any male gamete and female gamete. These factors relate to the fact that the offspring resemble their parents but are not exactly identical.

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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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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY