Georgia Science Grade 7

Chapter 5: Heredity

CRCT Practice

1
Huntington disease has a dominant (DD or Dd) inheritance pattern. What is the genotype of the father?

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A)DD
B)Dd
C)dd
D)D
2
Huntington disease has a dominant (DD or Dd) inheritance pattern. What is the genotype of the mother?

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A)DD
B)Dd
C)dd
D)D
3
Huntington disease has a dominant (DD or Dd) inheritance pattern. The genotype of the unaffected children is

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A)DD.
B)Dd.
C)dd.
D)D.
4
Heredity includes all of the following except
A)traits.
B)chromosomes.
C)nutrients.
D)phenotype.
5
Manipulating the arrangement of DNA that makes up a gene is called
A)genetic engineering.
B)chromosomal migration.
C)viral reproduction.
D)cross breeding.
6
How many phenotypes would result from the following Punnett square?

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A)1
B)2
C)3
D)4
7
Down syndrome is an example of
A)incomplete dominance.
B)genetic engineering.
C)a chromosome disorder.
D)a sex linked disorder.
8
What is a mutation?
A)a change in a gene that is harmful, beneficial, or has no effect at all
B)a change in a gene that is only beneficial
C)a change in a gene that is only harmful
D)no change in a gene
9
Sex of the offspring is determined by
A)only the mother, because she has two X chromosomes.
B)only the father, because he has one X and one Y chromosome.
C)an X chromosome from the mother and either an X or Y chromosome from the father.
D)mutations.
10
Create a Punnett square using the Shape of Pods trait crossing heterozygous parents. What percentage of the offspring will be heterozygous?

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A)none
B)25%
C)50%
D)100%
11
What percentage of the offspring will be homozygous?

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A)100%
B)50%
C)25%
D)none
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