CELL DIVISION
CELL DIVISION AND CANCEROUS CELLS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
an alteration in the chemical composition of a gene
|
|
|
a change in the chromosome number due to nondisjunction
|
|
|
a change in the chromosome composition due to crossing-over
|
|
|
an alteration in the number of sugars in DNA
|
Detailed explanation-1: -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-2: -Independent assortment produces new combinations of alleles. In meiosis I, crossing over during prophase and independent assortment during anaphase creates sets of chromosomes with new combinations of alleles. Genetic variation is also introduced by random fertilization of the gametes produced by meiosis.
Detailed explanation-3: -Recombination is a process by which pieces of DNA are broken and recombined to produce new combinations of alleles. This recombination process creates genetic diversity at the level of genes that reflects differences in the DNA sequences of different organisms.
Detailed explanation-4: -This process, also known as crossing over, creates gametes that contain new combinations of genes, which helps maximize the genetic diversity of any offspring that result from the eventual union of two gametes during sexual reproduction.