QUESTION IMAGE
Question
2
directions: type your answer in the box. use numerals, not words.
if a homozygous dominant parent and a heterozygous parent are crossed, what percentage of the offspring are expected to be
homozygous recessive?
%
Step1: 确定亲代基因型
假设显性基因用 \(A\) 表示,隐性基因用 \(a\) 表示。已知亲代一方为纯合显性(\(AA\)),另一方为杂合(\(Aa\))。
Step2: 进行遗传分析
纯合显性亲代(\(AA\))产生的配子只有 \(A\),杂合亲代(\(Aa\))产生的配子有 \(A\) 和 \(a\)。通过遗传图解分析后代基因型:
$$
LATEXBLOCK0
$$
后代基因型为 \(AA:Aa = 1:1\),没有纯合隐性(\(aa\))个体。
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