NEET Biology question
In *Drosophila*, the allele for a normal grey body colour is dominant to ebony body . The following table summarises the results of several crosses: I. Strain 1 × → All wild type; II. Strain 2 × → 1 wild type : 1 ebony; III. Strain 3 × → All ebony; IV. Strain 4 (× ) → 3 wild type : 1 ebony. Which strains both have the genotype ?
Answer: (D)
Solution
A cross of Strain 1 with giving all wild-type offspring indicates Strain 1 is homozygous dominant (); a cross of Strain 2 with giving a 1:1 wild:ebony ratio is a standard test cross result, indicating Strain 2 is heterozygous (); a cross of Strain 3 with
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