AP BIOLOGY

HEREDITY

LAW OF SEGREGATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What contributes to genetic variation?
A
crossing over
B
law of independent assortment
C
law of segregation
D
gene linkage
Explanation: 

Detailed explanation-1: -Genetic variation is also introduced by random fertilization of the gametes produced by meiosis. Any of the genetically unique sperm generated by a male may fertilize the genetically unique egg produced by a female.

Detailed explanation-2: -The physical basis for the law of independent assortment lies in meiosis I of gamete formation, when homologous pairs line up in random orientations at the middle of the cell as they prepare to separate.

Detailed explanation-3: -Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).

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