Mendelian Genetics

AP Biology· difficulty 1/5

A monohybrid cross of two heterozygous (Bb) parents is shown. B (black) is dominant to b (brown).

What is the expected phenotypic ratio of black to brown offspring?

A
$All black$
B
$3 black : 1 brown$
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C
$1 black : 1 brown$
D
$1 black : 2 black-brown : 1 brown$

Explanation

BB, Bb, Bb express the dominant black phenotype (3); bb expresses brown (1), giving 3:1.

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