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Meiosis Explains Mendel’s Results: Genes Are on Chromosomes The following diagram shows a hypothetical diploid cell. The recessive allele for albinism is represented by a , and d represents the recessive allele for deafness. The normal alleles for these conditions are represented by A and D , respectively. a. According to the principle of segregation, what is segregating in this cell? b. According to Mendel’s principle of independent assortment, what is independently assorting in this cell? c. How many chromatids are in this cell? d. Write the genotype of the individual from whom this cell was taken. e. What is the phenotype of this individual? f. What stage of cell division is represented by this cell (prophase, metaphase, anaphase, or telophase of meiosis I, meiosis II, or mitosis)? g. After meiosis is complete, how many chromatids and chromosomes will be present in one of the four progeny cells?

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 3, Problem 24QP
Textbook Problem
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Meiosis Explains Mendel’s Results: Genes Are on Chromosomes

The following diagram shows a hypothetical diploid cell. The recessive allele for albinism is represented by a, and d represents the recessive allele for deafness. The normal alleles for these conditions are represented by A and D, respectively.

  1. a. According to the principle of segregation, what is segregating in this cell?
  2. b. According to Mendel’s principle of independent assortment, what is independently assorting in this cell?
  3. c. How many chromatids are in this cell?
  4. d. Write the genotype of the individual from whom this cell was taken.

Chapter 3, Problem 24QP, Meiosis Explains Mendels Results: Genes Are on Chromosomes The following diagram shows a

  1. e. What is the phenotype of this individual?
  2. f.        What stage of cell division is represented by this cell (prophase, metaphase, anaphase, or telophase of meiosis I, meiosis II, or mitosis)?
  3. g. After meiosis is complete, how many chromatids and chromosomes will be present in one of the four progeny cells?

a.

Summary Introduction

To determine: The entity being segregated during meiosis in a cell.

Introduction: Meiosis, also known as the reductional division, is the second type of cell division that takes place in eukaryotes. The cell division is marked by a decrease in the chromosome number. This type of cell division allows the recombination of the genes on the chromosome to produce a zygote. The two diploid cells undergo division to produce four haploid daughter cells.

Explanation of Solution

Meiosis is the reductional division where the chromosomes are reduced to half of the number in each cell that forms the gametes. Each gametic cell receives 23 chromosomes that unite to form a diploid chromosome during fertilization. The cell division preceding meiosis is mitosis, where one cell divides into two by forming two daughter cells with 23 pair of chromosomes...

b.

Summary Introduction

To determine: The entities that are independently assorted in the cells during meiosis.

Introduction: The law of independent assortment is the third law of Mendelian genetics. It was given by performing a dihybrid cross, that is, the cross between the alleles of the two pairs of contrasting characters.

c.

Summary Introduction

  To determine: The number of chromatids in the cell.

Introduction: The chromosomes present in the offsprings are the mixture of the chromosomes of the parent organisms that are divided into half to form gametes, which then combine to form the zygote. Hence, the zygote contains each half of the parental chromosome.

d.

Summary Introduction

To determine: The genotype of the individual containing the chromosomes given.

Introduction: The genotype is the genetic constitution of the organism, while the phenotype refers to the external characters visible in an organism

e.

Summary Introduction

To determine: The phenotype of the individual.

Introduction: Albinism is an autosomal recessive condition where the pigment melanin is lost from the skin that provides color to the skin. The skin becomes whitish and pale, and is prone to damage under the sunlight due to albinism.

f.

Summary Introduction

To determine: The stage of cell division exhibited in the given figure.

Introduction: Meiosis, also known as the reductional division, is the second type of cell division that takes place in eukaryotes. The cell division is marked by a decrease in the chromosome number. This type of cell division allows the recombination of the genes on the chromosome to produce a zygote. The two diploid cells undergo division to produce four haploid daughter cells.

g.

Summary Introduction

To determine: The number of chromatids and chromosomes present in each cell after meiosis.

Introduction: Meiosis, also known as the reductional division, is the second type of cell division that takes place in eukaryotes. The chromatids condense to form chromosomes during prophase and the total four chromosomes are divided into four daughter cells giving each cell a haploid set of chromosomes.

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Human Heredity: Principles and Issues (MindTap Course List)
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