AP BIOLOGY

HEREDITY

NONDISJUNCTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What does meiosis provide that mitosis doesn’t?
A
extra gametes
B
genetic variability
C
polar bodies
D
genetic duplicity
Explanation: 

Detailed explanation-1: -Mitosis produces two diploid (2n) somatic cells that are genetically identical to each other and the original parent cell, whereas meiosis produces four haploid (n) gametes that are genetically unique from each other and the original parent (germ) cell.

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. Recombination or crossing over occurs during prophase I.

Detailed explanation-3: -Specifically, meiosis creates new combinations of genetic material in each of the four daughter cells. These new combinations result from the exchange of DNA between paired chromosomes. Such exchange means that the gametes produced through meiosis exhibit an amazing range of genetic variation.

Detailed explanation-4: -Because the genes contained in the duplicate chromosomes are transferred to each successive cellular generation, all mitotic progeny are genetically similar.

Detailed explanation-5: -Mitosis builds a person with an identical set of chromosomes in every cell. And meiosis generates reproductive cells with new combinations of gene variations. Chromosomes are sometimes gained, lost, or rearranged during meiosis and fertilization, causing people to have genetic disorders.

There is 1 question to complete.