9.Which is the genotype of an individual that could be used in a dihybrid cross? A. RRYY B. RRYy C. RrYY D. RrYy 10.Which disorder is a dominant trait? A. hemophilia B. cystic brosis C. Tay-Sachs disease D. Huntington's disease 11.In a family with three children, what is the probability that the rst child is a boy, the second child is a girl, and the third child is a boy? A. 12:5% B. 25% C. 50% D. 75%
Just solve question 9,10,11
6.If a true-breeding pea plant with yellow seeds is crossed with a true-breeding pea plant with green seeds, what is the probability that the F1 generation will have green seeds?
A. 0%
B. 25%
C. 75%
D. 100%
7. The hereditary units that Mendel called \factors" are known today as
A. genes
B. traits
C. chromosomes
D. characteristics
8. In snapdragons, a cross between a red-owering snapdragon and a white-owering snapdragon will produce snapdragons that have pink owers. This is an example of
A. complete dominance
B. incomplete dominance
C. X-linked dominance
D. codominance.
9.Which is the genotype of an individual that could be used in a dihybrid cross?
A. RRYY
B. RRYy
C. RrYY
D. RrYy
10.Which disorder is a dominant trait?
A. hemophilia
B. cystic brosis
C. Tay-Sachs disease
D. Huntington's disease
11.In a family with three children, what is the probability that the rst child is a boy, the second child is a girl, and the third child is a boy?
A. 12:5%
B. 25%
C. 50%
D. 75%
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