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 F1 generation 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:

Human Anatomy & Physiology (11th Edition)
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Author:Elaine N. Marieb, Katja N. Hoehn
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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 F1 generation 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

 

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What is the probability of dotted offspring being produced from the test cross described above

 

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