Two different genes control the expression of kernel colour in Mexican black corn: a black pigment gene (B) and a dotted pigment gene (D). Gene B influences the expression of gene D. The dotted phenotype appears only when gene B is in the homozygous recessive state. A colourless variation occurs when both genes are homozygous recessive. After pure-breeding black-pigmented plants were crossed with colourless plants, all offspring were black-pigmented. Plants of the F 1generation are suspected of being heterozygous for both genes. A test cross of colourless plants with the heterozygote plants should produce a genotypic ratio in the offspring of A. 1:0 B. 3:1 C. 2:1:1 D. 1:1:1:1
Two different genes control the expression of kernel colour in Mexican black corn: a black pigment gene (B) and a dotted pigment gene (D). Gene B influences the expression of gene D. The dotted
After pure-breeding black-pigmented plants were crossed with colourless plants, all offspring were black-pigmented.
Plants of the F 1generation are suspected of being heterozygous for both genes. A test cross of colourless plants with the heterozygote plants should produce a genotypic ratio in the offspring of
A. 1:0
B. 3:1
C. 2:1:1
D. 1:1:1:1
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images