Question

As a result of linkage and crossing over
A.Chromatids become chromosomes.
B.Nuclear divisions come to close.
C.Chromosomes become half.
D.Exchange of chromosomal material occurs.

Answer 1

Hint:Linkage guarantees to keep the genes in a chromosome to acquire or to be inherited together. Crossing over encourages the division of genes present in a chromosome and segregates into various gametes.

Complete answer:
Linkage: Two genes are supposed to be under linkage, or connected, when they dwell in a similar chromosome.

Genes that are situated on a similar chromosome are called linked genes. Alleles for these genes will in general isolate together during meiosis, except if they are isolated by crossing over .Crossing over happens when two homologous chromosomes exchange hereditary material during meiosis I. The closer together two genes are on a chromosome, the more outlandish their alleles will be isolated by crossing over.

Linkage clarifies why certain qualities are oftentimes acquired together. For instance, genes for hair tone and eye tone are connected, so certain hair and eye colors will in general be acquired together, for example, blonde hair with blue eyes and brown hair with brown eyes.

Hence, the correct answer is option D .

Note: Though,crossing over may happen when the arms of the chromatids of each homologous chromosome are matched during meiosis. Matching portions of the furthest points of two non-sister chromatids (one from one homologous of the pair) break and the pieces are exchanged, every one of them turning out to be essential for the arm of the other chromatid. Both linkage and crossing over brings about exchange of chromosomal materials.