Quiz about Genetics Quiz

Question 1

How many chromosome pairs do humans have?

Accepted Answer

23

Answer

46

Answer

69

Answer

92

Question 2

What are alleles?

Accepted Answer

Alternate forms of a gene

Answer

Multiple genes that code for more than two characteristics

Answer

Chromosome pairs that separate during meiosis

Answer

Characteristics that are passed on to all offspring

Question 3

The pea plant was a good organism to use for breeding experiments because it reproduced quickly and had easy to recognize traits. True or False?

Accepted Answer

True

Answer

False

Question 4

True-breeding plants are called

Accepted Answer

purebreds

Answer

hybrids

Answer

heterozygous

Answer

codominant

Question 5

When Mendel crossed the F1 plants (Aa x Aa), what did the offspring look like?

Accepted Answer

75% looked like the parents.

Answer

Half looked like one parent and half looked like the other parent.

Answer

All of them looked like the parents.

Answer

25% looked like the parents.

Question 6

If an organism has a dominant allele, then its phenotype will also be the dominant trait. True or False?

Accepted Answer

True

Answer

False

Question 7

A recessive allele can mask a dominant allele. True or False?

Accepted Answer

False

Answer

True

Question 8

In this cross, what is the probability that the offspring will have green pea pods?

Accepted Answer

50%

Answer

100%

Answer

75%

Answer

25%

Question 9

________ is the passing of traits or characteristics from one generation to the next.

Accepted Answer

Heredity

Answer

Cross breeding

Answer

Codominance

Answer

Dominance

Question 10

A lowercase letter in a Punnett square represents a ________ allele.

Accepted Answer

recessive

Answer

codominant

Answer

dominant

Answer

incomplete

Answer

multiple

Question 11

Which of the following is a heterozygous genotype that would show a dominant phenotype?

Accepted Answer

Rr

Answer

RR

Answer

rr

Question 12

If Mendel crossed a true-breeding tall plant (TT) with a true-breeding short plant (tt), what would the offspring look like?

Accepted Answer

all tall

Answer

all short

Answer

some short & some tall

Answer

all medium

Question 13

In rabbits, black fur is dominant to white fur. Two black rabbits are bred. Some of the offspring are white and some are black. What does this tell you about the parents?

Accepted Answer

Both must have a recessive allele.

Answer

Only one has a recessive allele.

Answer

Both are homozygous for the dominant allele.

Answer

One is homozygous for the dominant allele.

Question 14

A plant with yellow pea pods (pp) is crossed with a plant with green pea pods (PP). What is the phenotype of the offspring?

Accepted Answer

green pea pods

Answer

Pp

Answer

PP and pp

Answer

yellow pea pods

Question 15

Both alleles are always expressed for codominant genes. True or False?

Accepted Answer

True

Answer

False

Question 16

In this cross, what is the probability that the offspring will have black fur?

Accepted Answer

75%

Answer

100%

Answer

50%

Answer

25%

Question 17

For the genotype "AA," is it heterozygous (He) or homozygous (Ho)?

Accepted Answer

Homozygous (Ho)

Answer

Heterozygous (He)

Answer

Neither

Answer

Both

Question 18

What phenotype would result from the genotype "Pp" if purple flowers are dominant to white?

Accepted Answer

Purple flowers

Answer

White flowers

Answer

Blue flowers

Answer

Red flowers

Question 19

If "Bb" represents brown eyes being dominant to blue, what phenotype would "bb" produce?

Accepted Answer

Blue eyes

Answer

Brown eyes

Answer

Green eyes

Answer

Hazel eyes

Question 20

In a cross between "Rr" and "rr," what percentage of the offspring will have purple flowers if purple is dominant?

Accepted Answer

50%

Answer

0%

Answer

25%

Answer

100%

Question 21

What is the phenotype for the genotype "Tt" if tail spikes are dominant to plain tails?

Accepted Answer

Spikes

Answer

Plain tails

Answer

Curly tails

Answer

No tails

Question 22

What percentage of the offspring will be tall when a Tt plant is crossed with a Tt plant?

Accepted Answer

75%

Answer

25%

Answer

50%

Answer

100%

Question 23

What percentage of the offspring will be homozygous (RR) when a heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR)?

Accepted Answer

50%

Answer

0%

Answer

25%

Answer

100%

Question 24

In pea plants, what percentage of the offspring will have white flowers when two white flowered plants are crossed?

Accepted Answer

100%

Answer

0%

Answer

25%

Answer

50%

Question 25

In guinea pigs, the allele for short hair is dominant. What percentage of the offspring will have short hair when two heterozygous guinea pigs are crossed?

Accepted Answer

75%

Answer

25%

Answer

50%

Answer

100%

Genetics Quiz

Create a free account and access millions of resources

Popular Resources on Wayground

Discover more resources for Science