Glencoe Science Level Red

Chapter 20: The Role of Genes in Inheritance

Find a percentage

1
When sex cells form, each allele separates from its partner. Each sex cell will contain only one allele for each trait. (Assume that a parent is a hybrid for a certain trait. That means that the parent has a dominant and recessive allele for that trait.) What percent of the parent's sex cells will contain the recessive allele?
A)75%
B)25%
C)50%
D)100%
2
When sex cells form, each allele separates from its partner. Each sex cell will contain only one allele for each trait. (Assume that a parent has two dominant alleles.) What percent of the parent's sex cells will contain the dominant allele?
A)100%
B)25%
C)75%
D)50%
3
When sex cells form, each allele separates from its partner. Each sex cell will contain only one allele for each trait. (Assume that a parent has two dominant alleles.) What percent of the parent's sex cells will contain the recessive allele?
A)25%
B)0%
C)50%
D)100%
4
Some diseases in humans are a result of recessive traits. What percent of the sex cells produced by a parent would have an allele for this recessive trait?
A)75%
B)25%
C)50%
D)100%
5
Assume one parent is a hybrid for a trait, and the other parent has 2 recessive alleles for the same trait. When the sex cells join, what is the percent chance that the offspring will have the recessive trait?
A)50%
B)25%
C)75%
D)100%
6
Assume one parent has 2 recessive alleles for a trait, and the other parent has 2 recessive alleles for the same trait. When the sex cells join, what is the percent chance that the offspring will have the recessive trait?
A)75%
B)25%
C)100%
D)50%
7
Assume one parent has 2 dominant alleles for a trait, and the other parent has 2 recessive alleles for the same trait. When the sex cells join, what is the percent chance that the offspring will have the recessive trait?
A)100%
B)25%
C)50%
D)0%
8
Assume one parent has 2 dominant alleles for a trait, and the other parent is a hybrid for the same trait. When the sex cells join, what is the percent chance that the offspring will have the recessive trait?
A)50%
B)25%
C)0%
D)75%
9
Assume one parent has 2 dominant alleles for a trait, and the other parent has 2 recessive alleles for the same trait. When the sex cells join, what is the percent chance that the offspring will have the dominant trait?
A)100%
B)75%
C)50%
D)25%
10
Assume one parent has 2 dominant alleles for a trait, and the other parent is a hybrid for the same trait. When the sex cells join, what is the percent chance that the offspring will have the dominant trait?
A)100%
B)75%
C)50%
D)0%
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