Question

1) The source of the recombinants found above is A. crossing over B. Mitosis C.independent assortment...

1) The source of the recombinants found above is

A. crossing over

B. Mitosis

C.independent assortment of the chromosomes

D. none of the above

2) In fruit flies, a test cross for the traits 'black body' and 'vestigial wings' produced 17% recombinants. this result suggested that

A. the genes were carried on the same chromsome

B. the genes were carried on two different chromosomes

C. the traits are sex-linked

D. Some of the flies must have escaped

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Answer #1

1A) crossing over

When genes are situated on same chromosome,it is known as linked gene. This genes only get rearranged by means of crossing over. This rearrangement of genes are responsible for creating variations among individuals.

2. . the genes were carried on the same chromsome

according to the test cross, black body and vestigeal wings produced 17% recombinants.Or, the frequency of recombination between black body and vestigeal wings is 17%, Now, genes situated close in the chrosomoe are not assorting independently and will show recombination frequency less than 50%. Whereas, the genes which are situated on different chromosome, will be assorted independently and will show linkage frequency of 50%

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