NEET Biology question
I. 100% parental combinations are found in F2-generation; II. F2 phenotypic ratio is 3:1 in dihybrid cross; III. Dihybrid test cross ratio is 1:1 in F2-generation; IV. Linked genes tends to separate frequently. Choose the correct options from the above given statements.
Answer: (D)
Solution
For two completely linked genes, all offspring show only the original parental combinations (100%, statement I), a dihybrid cross behaves like a single-gene cross giving a 3:1 phenotypic ratio instead of 9:3:3:1 (statement II), and the corresponding test cross gives a 1:1 ratio instead of
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