CELL STRUCTURES AND FUNCTION
CELL DIVISION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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an alteration in the chemical composition of a gene
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a change in the chromosome number due to nondisjunction
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a change in the chromosome composition due to crossing-over
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an alteration in the number of sugars in DNA
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Detailed explanation-1: -Answer and Explanation: The new traits are formed from existing genes due to crossing over. The crossing-over takes place when genetic segments are exchanged between non-sister chromatids of the homologous chromosome. It brings about chromosomal recombination resulting in a new combination of genes.
Detailed explanation-2: -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.
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.