7th Grade, Unit 3: Intro To Genetics Question Preview (ID: 48668)


Science 7A: Mrs. McKinley. TEACHERS: click here for quick copy question ID numbers.

A dog is trained to sit and shake hands. These traits are most likely
a) inherited.
b) not inherited.
c)
d)

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) 50%
c) 75%
d) 100%

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.
c)
d)

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.
c)
d)

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) red flowers
c) white flowers
d)

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.
c)
d)

Chromosome pairs contain different versions of genes, which are called
a) alleles
b) DNA
c) RNA
d)

The process in which body cells are duplicated in order to grow and repair body tissues is called
a) mitosis
b) meiosis
c)
d)

The process in which the chromosomes in sex cells are reduced by half is called
a) mitosis
b) meiosis
c)
d)

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
c)
d)

Genes are specific sections of
a) DNA
b) RNA
c)
d)

To pass its traits on to the next generation, an organism must
a) reproduce
b) carry the same DNA
c)
d)

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