A heterozygous pea plant with violet flowers was crossed with a homozygous pea plant with white flowers. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed?
30 produced violet and 10 produced white flowers
20 produced violet and 20 produced white flowers
All 40 produced violet flowers
All 40 produced white flowers
, a cross between an organism showing a dominant phenotype (heterozygous, e.g., Ww) and the recessive parent (homozygous white, ww) is called a test cross . The textbook provides a specific example using violet and white flowers, showing that such a cross yields progenies in a 1:1 ratio of dominant (violet) to recessive (white) phenotypes . Therefore, out of 40 progenies, half (20) will be violet and half (20) will be white.
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