When a test cross is performed between F_1 hy | vedclass

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(B) In genetics,when two genes are located on the same chromosome,they are said to be linked. Linkage refers to the physical association of genes on a

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The two genes are linked and present on the same chromosome.

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(B) In genetics,when two genes are located on the same chromosome,they are said to be linked. Linkage refers to the physical association of genes on a chromosome. According to Morgan's experiments on Drosophila,genes that are closely linked show very low recombination frequency,meaning the parental combinations are inherited together much more frequently than the recombinant types. If genes were on different chromosomes,they would show independent assortment,resulting in a $1:1:1:1$ ratio in a test cross,where parental and recombinant types are equal. Since parental types are significantly higher,it indicates that the genes are linked and located on the same chromosome.

When a test cross is performed between $F_1$ hybrid flies,the parental type offspring are produced in much higher frequency than the recombinant type offspring. What does this indicate?

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