Q. A condition, where a certain gene is present in only a single copy in a diploid cell, is called
A) Four different types of gametes produed by the $F_{1}$-dihybrid
B) Homozygous condition of the $F_{1}$-dihybrid
C) Four different types of${\ F}_{1}$-dihybrids
D) Four different types of gametes produed by the $P_{1}$-parent
Explanation
When the $F_{1}$-hybrid is crossed with recessive parent, both phenotypes appear in progeny and this is called test cross. It gives 1 : 1 ratio in monohybrid cross and 1 : 1 : 1 : 1 ratio in dihybrid cross.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.