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Worksheets

Genetics Basics

Total questions: 25

Worksheet time: 25mins

Name
Class
Date
1.

Which genotype is homozygous dominant?

a)

Mm

b)

HH

c)

nn

d)

rR

2.

If red flowers is dominant in the Punnett square, what is the probability that the offspring will have red flowers?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

3.

Dominant alleles are represented by which letter?

a)

capital

b)

lowercase

c)

genotype

d)

phenotype

4.

If red flowers is dominant over white flower, what phenotype would be expressed by the genotype Rr

a)

pink flowers

b)

white flowers

c)

red flowers

d)

purple flowers

5.

True or false? Hybrid is a synonym for heterozygous genotypes.

a)

True

b)

False

6.

If red flowers are dominant to white flowers, what is the ratio of white to red flowers in the Punnett squares?

a)

0:4

b)

1:3

c)

2:2

d)

3:1

e)

4:0

7.

How many alleles are on each gene?

a)

1/2

b)

1

c)

2

d)

23

8.

If brown eyes are dominant over blue eyes, what will be the phenotype of an organism that is a hybrid?

a)

bb

b)

BB

c)

bB

d)

blue eyes

e)

brown eyes

9.

Which of the following represents a purebred recessive genotype?

a)

JJ

b)

eE

c)

Hh

d)

rr

10.

Which of the following are PHENOTYPES?

a)

red hair

b)

Gg

c)

seven toes

d)

SS

e)

cc

11.

Which of the following are GENOTYPES?

a)

crooked pinky finger

b)

Dd

c)

QQ

d)

Orange teeth

e)

ff

12.

Which of the following represent DOMINANT alleles?

a)

D

b)

Q

c)

v

d)

P

e)

u

13.

Which of the following represent recessive alleles?

a)

R

b)

r

c)

T

d)

H

e)

y

14.

A genotype with two dominant alleles is known as:

a)

Homozygous dominant

b)

homozygous recessive

c)

heterozygous

15.

A genotype with two different alleles is known as:

a)

homozygous dominant

b)

homozygous recessive

c)

heterozygous

16.

Which genotype is homozygous recessive?

a)

BB

b)

tt

c)

Cc

17.

Which of the following is a homozygous dominant genotype?

a)

tt

b)

gg

c)

WW

d)

Xx

18.

In pea plants, plant height is a genetic trait. Tall (T) is dominant over dwarf (t). Which genotype would produce a dwarf plant?

a)

TT

b)

Tt

c)

tt

19.

In humans, the ability to "roll" your tongue is dominant (R) over not being able to roll your tongue (r). Which of the following genotypes would show a person who CAN roll their tongue?

a)

rr

b)

Rr

c)

RR

20.

The allele for blue eyes is recessive (b). The allele for brown eyes is dominant (B). What color eyes does someone with the genotype bb have?

a)

blue

b)

brown

c)

purplish-green

21.

Monsters with red skin have the dominant trait. Which of the following could be the genotype of this monster?

a)

rr

b)

red skin

c)

Rr

d)

RR

22.

Fluffy feathers (F) are dominant in owls. Flat feathers (f) are recessive. This owl has the genotype Ff. What is his phenotype?

a)

Brown eyes

b)

fluffy feathers

c)

flat feathers

d)

FF

23.

2 different alleles

a)

homozygous dominant

b)

homozygous

c)

heterozygous

d)

purebred

24.

Different forms of a gene

a)

alleles

b)

dominance

c)

recessive

25.

Abigail has a mother who is homozygous domiant for the brown hair trait and a father who is heterozygous for brown hair and blonde hair. What would the alleles portray for Abigail's mother?

a)

BB

b)

Bb

c)

bb

d)

brown hair