Free Printable Genetics

1.

The study of ____ is called genetics.

a)

heredity

b)

dominance

c)

pea plants

d)

mutations

2.

Genes come from

a)

nature

b)

parents

c)

our environment

d)

the store

3.

The _____________________ represents the appearance of an organism.

a)

genotype

b)

phenotype

c)

chromosome

d)

gene

4.

What trait is represented by a capitol letter and always shows up in an organism when the allele is present?

a)

probability

b)

learned

c)

dominant

d)

recessive

5.

How many alleles does an offspring receive from each parent to determine a specific trait?

a)

one

b)

two

c)

three

d)

four

6.

Where is the majority of DNA stored within a cell?

a)

cell membrane

b)

mitochondria

c)

cytoplasm

d)

nucleus

7.

Which of the following in NOT an example of a trait?

a)

eye color

b)

ear shape

c)

species

d)

body height

8.

What model can be used to show traits and help determine genotypes of genetically related family members over several generations?

a)

Punnett square

b)

ratio

c)

phenotype

d)

pedigree

9.

What trait is represented by a lowercase letter and hidden whenever the dominant allele is present?

a)

dominant

b)

recessive

c)

heterozygous

d)

phenotype

10.

Which of the following is a phenotype?

a)

BB

b)

bb

c)

Bb

d)

brown eyes

11.

A child looks more like one parent than the other because a child only inherits

chromosomes from one parent.

a)

True

b)

False

12.

If “T” represents a tall plant and “t” represents a short plant, then a plant with “Tt” will be

a)

tall

b)

short

c)

medium

d)

cannot be

determined

13.

G=green, g=yellow

The genotype for a yellow plant would be:

a)

GG

b)

Gg

c)

gg

d)

all of the above

14.

What is true when a dominant and a recessive gene are present?

a)

You will see the dominant trait.

b)

You will see the recessive trait.

c)

You will see both traits.

d)

You will see neither trait.

15.

On a pedigree, what do circles represent?

a)

males

b)

females

c)

organism has the trait

d)

organism does not have the trait

16.

Tt represents which type of trait?

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous

d)

none of the above

17.

Two brown eyed parents who each have the genotype Bb have a baby. What is the probability that they will have a blue eyed baby?

a)

0%

b)

25%

c)

50%

d)

75%

18.

When Mendel crossed a true-breeding plant with purple flowers and true-breeding plant with white flowers, ALL offspring had purple flowers. The best explanation for this data is that the white flowers are:

a)

dominant

b)

heterozygous

c)

recessive

d)

neutral

19.

On a Punnett Square, two capital letters indicate a gene that is

a)

heterozygous

b)

homozygous dominant

c)

homozygous recessive

d)

none of the above

20.

Plant A has round seeds with a genotype of RR and Plant B has wrinkled seeds with a genotype of rr. What type of seeds would result from this cross?

a)

100% round

b)

100% wrinkled

c)

50% round

d)

25% wrinkled

21.

A florist has one kind of plant that usually has red flowers (the dominant trait), but sometimes has white flowers (the recessive trait). If she crosses plants A and B as shown here in the Punnett Square, what percentage of the plants will be red?

a)

0%

b)

25%

c)

50%

d)

100%

22.

A heterozygous red-flowered plant is crossed with a homozygous white-flowered plant. If red is a dominant allele and white is recessive, what color ratio will the flowers of the offspring plants have?

a)

1 red: 3 white

b)

4 red: 0 white

c)

2 red: 2 white

d)

0 red: 4 white

23.

Using the Punnett Square, what is the probability that the offspring will have the dominant trait?

a)

25%

b)

50%

c)

75%

d)

100%

24.

Using the Punnett Square, what belongs in the empty box?

a)

AA

b)

Aa

c)

aa

d)

aA

25.

Using the Punnett Square, what genotype would be in the bottom right box?

a)

BB

b)

Bb

c)

bb

d)

bB

Genetics

Total questions: 25

Worksheet time: 13mins

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