Unit Test — Unit test Answers

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A fruit fly has black eyes. Having red eyes is a dominant trait (R) and having black eyes is a recessive trait (r).Which describes the fruit fly’s genotype and phenotype?

A
genotype: black eyesphenotype: Rr
B
genotype: black eyesphenotype: rr
C
genotype: rrphenotype: black eyes
D
genotype: Rrphenotype: black eyes
22
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A mutation causes a tomato plant to have fewer and smaller leaves. Plants use their leaves to make food. Which best describes this mutation?

A
It is harmful because it obviously affects the plant’s ability to survive.
B
It is beneficial because it affects the plant’s physical appearance.
C
It is neutral because it does not obviously affect the plant’s ability to survive.
D
It is neutral because it affects the plant’s physical appearance.
23

Which best describes a genetic mutation?

A
a random change to an organism’s DNA
B
a condition that shortens an organism's lifespan
C
a trait that an organism inherits from its parents
D
a building block of an organism's genetic code
24

What was known before Franklin and Wilkins conducted their studies of DNA? Select three options.DNA is found in the nucleus of a cell. The human genetic code is made of 50,000 genes.Organisms store and transmit genetic information. DNA has a double-helix structure. Cells contain protein molecules.

A
DNA is found in the nucleus of a cell.
B
The human genetic code is made of 50,000 genes.
C
Organisms store and transmit genetic information.
D
DNA has a double-helix structure.
E
Cells contain protein molecules.
25

What is the result when a plant with red flowers (RR) is crossed with a plant with yellow flowers (YY), assuming the alleles are codominant?

A
flowers with all red petals
B
flowers with all yellow petals
C
flowers with all orange petals
D
flowers with a mixture of red and yellow petals

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