In a test cross involving F₁ dihybrid flies, more parental type offspring were produced than the recombinant-type offspring. This indicates

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the two genes are linked and present on the same chromosome

both of the characters are controlled by more than one gene

chromosomes failed to separate during meiosis.

the two genes are located on two different chromosomes

answer is A.

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Detailed Solution

If, in a test cross involving $F_{1}$ dihybrid flies, more parental (more than 50%) offspring are produced than the recombinants, it indicates that the two genes considered are present on the same chromosome and they are described as linked genes. This was first discovered by Morgan, and the phenomenon is called linkage.

(2) If a character or phenotype is controlled by more than one gene, it is called polygenic inheritance.

(3) If the two genes are present on different chromosomes, the parental and recombinant types are formed 50% each in a test cross of a dihybrid.

(4) If chromosomes of a pair or all the pairs fail to separate during meiosis, then there is possibility of formation of offspring as aneuploids or polyploids.

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