AnswersCO-Biology A-CRUnit Test

Introduction to Genetics Answers

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During an experiment, a scientist crosses a pea plant that has purple flowers with a pea plant that has white flowers. The plants that result from this cross in the F1 generation have both purple and white flowers. What can the scientist conclude?

A
White flowers are dominant over purple flowers.
B
Neither purple flowers nor white flowers are dominant.
C
The plants in the P generation were not true-breeding.
D
All the plants in the F2 generation will have purple flowers.
2
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Which statement best describes an understanding of genetics that would be missing without the work of Mendel?

A
The DNA codes for traits would not be known.
B
The protein codes for traits would not be known.
C
Some alleles are dominant, and some alleles are recessive.
D
Offspring receive two copies of each allele from each parent.
3

In pea plants, tall plant height is dominant over short plant height. If there are 200 short plants in the F2 generation from a cross that followed Mendel’s methods, about how many plants will be tall in that generation?

A
200
B
300
C
600
D
1,000
4

Which is the best example of a hypothesis leading to new experimental methods?

A
Gregor Mendel influenced the development of the theory that everything is made of cells.
B
Gregor Mendel continued the genetic research of Thomas Hunt Morgan, but Mendel used pea plants.
C
Thomas Hunt Morgan continued the genetic research of Gregor Mendel, but Morgan used fruit flies.
D
The theory that everything is made of cells influenced Gregor Mendel in his research.
5

What controls traits and inheritance?

A
gametes
B
nucleic acids
C
proteins
D
temperature
6

What alternate form of genes do nucleic acids have that allows them to offer variability?

A
allele
B
codon
C
nucleotide
D
chromosome
7

The table below summarizes the traits that Mendel examined during his experiments.Traits Studied by MendelWhat do these characteristics all have in common?

Question illustration
A
They are all dominant.
B
They can all be easily observed.
C
They are all recessive.
D
They can all be applied to other plants.
8

Which statement describes Mendel’s hypotheses regarding gametes?

A
A gamete carries two genes for a trait.
B
A gamete carries one allele for a gene.
C
A gamete can carry multiple alleles for a trait.
D
Some gametes are dominant and some are recessive.
9

Gregor Mendel’s research formed the basis of the field of

A
genetics.
B
dominance.
C
recessiveness.
D
selective breeding.
10

Scientists often use fruit flies as a method to test hypotheses about human genes. Why are fruit flies advantageous in the study of human inheritance?

A
They can self-pollinate.
B
They lack nucleic acids.
C
They are very different from humans.
D
They reproduce quickly and take up little space.

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