Question

If you cross homozygous recessive short plant with heterozygous purple flower to heterozygous tall plant with heterozygous purple flower, what will be the expected phenotypic ratio?

(a) 9:3:3:1

(b) 4:4:2:2

(c) 3:1:3:1

(d) 1:2:1:2:4:2:1:2:1

I have been asked this question by my college professor while I was bunking the class.

The above asked question is from Dihybrid Cross topic in chapter Mendelian Genetics of Cytogenetics

Answer 1

Correct answer is (c) 3:1:3:1

Explanation: In this cross the ratio would be as follows 3(tall purple): 1 (tall white): 3 (short purple):1 (short white). This is a test cross for height gene but not for colour gene.