本题目来源于试卷: Continuity and Change D.8 Inheritance，类别为 IB生物学
[单选题]
Mendel observed that there are two possible variations of flower w tfb;3c, qq7lcolou5q.mgi xf2ya.r in pea plants, purple and wf.a2.iygmqx 5 hite. After a genetic cross, the ratio of plants with purple flowers to white flowers is 1:1. What were the genotypes of the parents?
A. Both parents are heterozygous.
B. One parent is heterozygous and the other is homozygous recessive.
C. Both parents are homozygous recessive.
D. One parent is heterozygous and the other is homozygous dominant.
参考答案: B
本题详细解析:
| 
