Free Printable Genetics Review

Worksheets

Genetics Review

Total questions: 27

Worksheet time: 12mins

Name

Class

Date

An offspring will receive how many alleles from each parent to determine a specific trait?

one

two

three

five

Which of the following is a phenotype?

Blue eyes

having two of the same genes for the trait (sometimes called purebred).

homozygous

hetrozygous

protein

chromosome

One form of a gene is called_______________

a DNA

a Phenotype

a trait

an allele

If green is dominant over purple, then what is the genotype for this individual?

Purple

Green

In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?

Tall = T
Short = S

Tall = T
Short = t

Tall = t
Short = T

Tall = TT
Short = tt

Which of the following genotypes is homozygous dominant?

What are the phenotype percentages of the offspring?

(A-Brown fur color; a-white fur color)

50 % Brown fur and 50% White fur

25 % Brown fur and 75% White fur

75 % Brown fur and 25% White fur

0% Brown fur and 100% White fur

What are the possible genotypes for this cross?
(Click the picture to see it without the text)

TT = 25% Tt= 50% tt=25%

all tall

TT= 75% tt = 25%

Tt = 100%

10.

B=Brown fur

b=tan fur

What percent of the offspring would be tan when you cross BbxBb?

75%

25%

50%

100%

11.

In rabbits, black fur (B) is dominant over brown fur (b). If a rabbit has brown fur, what can you conclude about its genotype?

It is BB.

It is Bb

It is brown

It is bb.

12.

This punnett square shows a cross between

A hybrid Parent and a Homozygous parent

A heterozygous parent and a heterozygous parent

Two homozygous parents

Two Hybrid Parents

13.

One dog carries homozygous, long-haired traits (SS), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.

100%

75%

50%

25%

14.

Genotype refers to the ...

physical expression of the genes

the possible combination of alleles in a gene

whether an allele is dominant or recessive

how an organism will appear

15.

Which of the choices is homozygous recessive?

16.

Which of the choices is heterozygous?

17.

Which of the choices is homozygous dominant?

18.

Y for yellow body is dominant over y for blue body. What alleles would produce yellow bodies?

YY,yy

Yy,yy

YY only

YY,Yy

19.

The exact genetic makeup of an organism, such as RR, Tt, PP is its?

phenotype

dominance

genotype

trait

20.

If "T" is the allele for tall and "t" is the allele for short, then Tt would produce?

tall

short

medium

not enough info

21.

A physical characteristic that can be passed from parent to offspring.

behavior

trait

strong muscles

ability to fly a plane.

22.

Alternant or different genes that code for the same trait are called?

chromosomes

segments

alleles.

homozygous.

23.

What plant did Mendel study?

pea plant

spinach

carrots

sunflowers

24.

Which of the following alleles is homozygous (purebred) recessive?

25.

Females-XX; MalesXY. A couple has 4 girls. What is the chance the next child will be a boy?

75%

100%

25%

50%

26.

Round seeds (R) are dominant over wrinkled seeds (r). What percentage of the offspring will be round from the following cross?
RR X Rr

100%

75%

50%

25%

27.

A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant. What percentage of the offspring will be homozygous recessive?
R = round
r = wrinkled

75%

50%

25%

Reset

Genetics Review

Total questions: 27

Worksheet time: 12mins

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