Question

If an H is for tall trait which is dominant and h is the recessive trait for short, which of the following cross will result in 1:1 tall: short progeny?

(a) HH X hh

(b) Hh X Hh

(c) Hh X hh

(d) hh X hh

I had been asked this question in exam.

This intriguing question originated from Monohybrid Cross topic in section Mendelian Genetics of Cytogenetics

Answer 1

Right option is (c) Hh X hh

Easiest explanation: The Punett square shows that the cross between Hh and hh produces Hh and hh in the ratio of 1:1. Here Hh will be tall and hh will be short, thus it produces them in 1:1 ratio as well.