When homologous chromosomes crossover, what occurs?

ATwo chromatids get tangled, resulting in one re-sequencing its DNA.
BTwo sister chromatids exchange identical pieces of DNA.
CSpecific proteins break the two strands and re-join them with their homologs.
DEach of the four DNA strands of a tetrad is broken and the pieces are mixed.
EMaternal alleles are "corrected" to be like paternal alleles and vice versa.

Question

08-04-2016
Biology

Answered

When homologous chromosomes crossover, what occurs?

ATwo chromatids get tangled, resulting in one re-sequencing its DNA.
BTwo sister chromatids exchange identical pieces of DNA.
CSpecific proteins break the two strands and re-join them with their homologs.
DEach of the four DNA strands of a tetrad is broken and the pieces are mixed.
EMaternal alleles are "corrected" to be like paternal alleles and vice versa.

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taskmasters taskmasters · Answer 1 · 2016-04-11T08:13:04-04:00

B) Two sister chromatids exchange identical pieces of DNA.

The homologous chromosomes have the same genes in common. Each cell has at least two sets of chromosomes which one comes from one’s father also called as paternal chromosome and mother, called as the maternal chromosomes. These chromosomes are what makes the child obtain the characters and may depend on the traits the parents possess. Homologous chromosomes are not duplicated chromosomes or identical however, they are analogous or similar.