New combinations of genetic material give rise to genetic variability in sexually reproducing organisms through crossover...

New combinations of genetic material give rise to genetic variability in sexually reproducing organisms through

crossover events between nonsister homologous chromatids.
crossover events between sister chromatids.
egg and sperm genetic recombination from distinct individuals.
egg and sperm genetic recombination from one individual in which crossing over and independent assortment of homologues has occurred.
A, C, and D all contribute to genetic variability.

Expert Solution

Answer - e. A, C, and D all contribute to genetic variability.

Explanation - Genetic variation can arise from two process crossing over between nonsister chromatid of homologous chromosomes and/or independent assortment of chromosmes

a. crossover events between nonsister homologous chromatids.- Correct - Recombination crossover occurs between nonsister chromatids of homologous pair of chromosomes.

b. crossover events between sister chromatids.- incorrect - Cross over does not occur between sister chromatids.

c.egg and sperm genetic recombination from distinct individuals.- Correct - egg and sprem consisting recombinant chromosmes arise from crossing over during meiosis and may combine due to independent assortment of parental and recombinant chromosmes leads to generation of a new non-parental phenotype or genetic variability.

d.egg and sperm genetic recombination from one individual in which crossing over and independent assortment of homologues has occurred - correct - In this case similar to case of option c. the resultant zygote generated from fertilization of egg and spern consist genetic material may be recombinant type (generated due to crossing over) and independent assortment generating genetic variability.

Therefore, option a, c and d are correct.

Hnece, the correct option is option e.

A, C, and D all contribute to genetic variability.

gladiator answered 2 years ago

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