Why there are more of the parental phenotypes and fewer of the recombinants? Can

Question

Why there are more of the parental phenotypes and fewer of the recombinants? Can you explan it for me ?

Thank you so much

(6 marks) A true-breeding Drosophila with red eyes and small body size was crossed with a true-breeding Drosophila with scarlet eyes and normal body size. The F1 all had red eyes and normal body size. The Fl were crossed with Drosophila with scarlet eyes and small bodies. The progeny were as follows 4. red eyes and normal body size 56 red eyes and small body size 218 scarlet eyes and normal body size 182 scarlet eyes and small body size 44 Explain why you suspect these genes are on the same chromosome f they were on different chromosomes they would assort independently at meiosis () and the FI ratio would be 1:1:1:1 (or equal mmbers of each phenotype) (2). But there are more of the parental phenotypes (1.5) an fewer of the recombinants (1.5)

Explanation / Answer

Ans:-(4).  Explaination:-According to the Mendels independent assortment which states that alleles of different genes will segregate independently into gametes but in reality this is not always the case but in some cases the certain genes are inherited together, and they do not appear to undergo independent assortment at all. This phenomenon is called as genetic linkage which is said to the the violation of the Mendelian principle of independent assortment, it generally describes an inheritance pattern in which two genes located in close proximity to each other on the same chromosome have a biased association between their alleles. hence causes these alleles to be inherited together instead of assorting independently.

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