Which of the following statement(s) are true? Morgan traced the eye colour gene

Question

Which of the following statement(s) are true? Morgan traced the eye colour gene in flies to the X chromosome. 50% recombinant progeny are observed for two unlinked genes, which is due to the independent assortment of homologous chromosomes in metaphase 1 In very long chromosomes > 50% recombination can be observed. Crossing over between homologous, parental chromosomes is the mechanism of breaking up linkage of two genes to form recombinant chromosomes. The frequency of recombination is directly proportional to the distance between the two linked loci as the chance of crossing over is equal on all points of the chromosome. All of the above All but C A and D.

Explanation / Answer

Answer:

a) true,

b) true, in unlinked genes, it is by independent assortment. In linked genes, recombination occur by crossing over.

c) true,   more than 50% recombination will not takes place, the crossing over events occur in equal frequency when genes are at opposite ends.

d) true, during crossing over, linkage in genes is broken and new genes are attached due to exchange of genetic material during meiosis.

e) true,

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