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7th Grade, Unit 3: Intro To Genetics
Test Description: Science 7A: Mrs. McKinley
Instructions: Answer all questions to get your test result.
1) A dog is trained to sit and shake hands. These traits are most likely
A
inherited.
B
not inherited.
2) In a particular breed of cattle, a black coat is dominant over a red coat. If a cow with a red coat is crossed with a black bull that is heterozygous for coat color, what percentage of their offspring would you expect to be black?
A
25%
B
75%
C
50%
D
100%
3) What is a mutation?
A
A mutation is a permanent change in the order of bases in the DNA.
B
A mutation is a temporary change in the order of bases in the DNA.
4) n humans, having dimples is a dominant trait. In order for a child to have dimples
A
at least one parent must have dimples and pass on the dominant allele.
B
at least one parent must not have dimples and pass on the recessive allele.
5) A scientist is studying a plant species in which the flower color genes are codominant. The scientist crosses a plant with red flowers and a plant with white flowers. The offspring will most likely have
A
red flowers with white patches.
B
white flowers
C
red flowers
6) In order for a child to inherit a recessive genetic disease, like sickle cell anemia, healthy parents must both
A
be carriers of the mutated gene that causes the disease.
B
have the disease.
7) Chromosome pairs contain different versions of genes, which are called
A
RNA
B
alleles
C
DNA
8) The process in which body cells are duplicated in order to grow and repair body tissues is called
A
mitosis
B
meiosis
9) The process in which the chromosomes in sex cells are reduced by half is called
A
meiosis
B
mitosis
10) A white mouse is crossed with a black mouse. All the offspring were grey. The genes for fur color in mice show
A
incomplete dominance
B
DNA
11) Genes are specific sections of
A
DNA
B
RNA
12) To pass its traits on to the next generation, an organism must
A
carry the same DNA
B
reproduce
*select an answer for all questions
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