Q. In $Drosophila$, the allele for a normal grey body colour G is dominant to ebony body g. The following table summarises the results of several crosses [table] S.No | Cross | Result ; I. | Strain 1 $\times$ gg | All wild type ; II. | Strain 2 $\times$ gg | 1 wild type : 1 ebony ; III. | Strain 3 $\times$ gg | All ebony ; IV. | Strain 4 $\times$ gg | 3 wild type : 1 ebony [/table] Which strains both have the genotype Gg?
A) I and III
B) I and IV
C) II and III
D) II and IV
Explanation
Condition I cross between Gg and gg Condition II Cross between Gg and Gg So, strain II and strain IV are heterogametic (Gg)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.