question_answer

In a monohybrid cross when \[{{F}_{1}}\] is crossed with homozygous dominant parent then which type of offsprings will obtain?

A)  Dominant; recessive (3 : 1)

B)  Only recessive

C)  Dominant: recessive (1 : 1)

D)  No recessive

Correct Answer: D

Solution :

According to Mendels law there is no offspring recessive when homozygous dominant parent is crossed with F1 in monohybrid cross. Example: Red flower    White flower \[\begin{align}   & RR\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\times \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,rr \\  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\downarrow  \\  & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Rr-{{F}_{1}} \\ \end{align}\] (Hybrid Red) Heterozygous   x   Homozygous F1 individual         Red (parent)