GENERAL HISTOLOGY

INTRODUCTION

CELL STRUCTURE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Genetic variation among species is caused by ____
A
Substitution
B
Asexual Reproduction
C
Mitosis
D
Meiosis
Explanation: 

Detailed explanation-1: -Meiosis also produces genetic variation by way of the process of recombination. Later, this variation is increased even further when two gametes unite during fertilization, thereby creating offspring with unique combinations of DNA.

Detailed explanation-2: -Genetic variation is increased by meiosis Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote.

Detailed explanation-3: -Mitosis builds a person with an identical set of chromosomes in every cell. And meiosis generates reproductive cells with new combinations of gene variations.

Detailed explanation-4: -Genetic variation is introduced in multiple ways, including changes in mitosis, crossing over and random orientation in meiosis, and random fertilization.

Detailed explanation-5: -Genetic variation is created in meiosis by two important mechanisms, namely independent assortment of gametes and genetic recombination via crossing over. During meiosis, a cell divides and its genetic information is divided into 4 gametes. Thus, the genetic information of the parent cell is randomly divided.

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