Free Printable Genetics

Worksheets

Genetics

Total questions: 32

Worksheet time: 23mins

Name

Class

Date

A homozygous recessive dog with white fur is crossed with a heterozygous dog with brown fur. What are the percentages of the possible genotypes?

100% BB

75% BB and 25%Bb

50 % Bb and 50% bb

50% BB and 50% Bb

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

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?

Brown hair

the passing of genetic traits from parent to offspring.

heredity

trait

gene

allele

Having two of the same genes for the trait.

homozygous

hetrozygous

protein

chromosome

Magda is a tall, 11 year old drummer. She has a scar on her right cheek. She is good at swimming. Which of her traits did Magda most likely inherit?

height

the scar

ability to swim

ability to play drums

Two heterozygous (Tt) tall pea plants are crossed. Which describes their offspring?

50% tall and 50% short

75%tall and 25% short

100%short

One form of a gene is called_______________

a DNA

a Phenotype

a trait

an allele

10.

The condensed form of DNA is called________________

an allele

a gene

a chromosome

a phenotype

11.

Where, in the eukaryotic cell, is DNA located?

ribosomes

nucleus

E.R.

cytoplasm

12.

What is the percentage of offspring that have green pods?

100%

75%

50%

25%

13.

What is the phenotype of the heterozygous parent in the punnett square?

green

yellow

hybrid

purebred

14.

W=white hair

w= non-white hair

If you cross a horse with the WW genotype and a horse with a ww genotype what fraction of the offspring would be expected to have white hair?

none

3/4

1/2

all

15.

An allele whose trait always shows up in the organism when the allele is present.

recessive allele

dominant allele

hidden allele

present allele

16.

An organism's appearance or other detectable characteristic

genotype

phenotype

genetics

heterozygous

17.

father of genetics

Gregor Mendel

James Watson

Dr. Robbins

Francis Crick

18.

A single piece of coiled DNA found in the cells; contains genes that encode traits.

gene

chromosome

trait

DNA

19.

B=brown eyes
b= blue eyes
What is true about two brothers that have brown eyes?
One has genotype BB the other Bb.

they have same phenotype and genotype

they have different genotypes and phenotypes

they have same phenotype but different genotypes

they have same genotype but different phenotypes

20.

What does heterozygous mean?

An organism that has the same genes for a trait (TT or tt)

An organism that has different genes for a trait (Tt)

When neither gene is fully dominant; offspring is a mixture of both

the different forms of a trait (hair color--> brown, blonde, red

21.

If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?

100% Tt

50% Tt, 50% tt

75%Tt, 25%tt

25%TT, 50%Tt, 25%tt

22.

If T=Tall & t=short, what is the genotypic ratio?

1:3

3:1

1:2:1

2:2

23.

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?

0 %

25%

50%

75%

24.

A corn plant heterozygous for tall sprouts mates with a corn plant with short sprouts. If tall sprouts are dominant, how many different phenotypes are possible in the offspring?

25.

A heterozygous yellow pea plant's genotype would be:

26.

Which process and type of resulting cells are represented?

mitosis, gametes

mitosis, body cells

meiosis, gametes

meiosis, body cells

27.

Which of the following cell types is formed by meiosis?

muscle cells

skin cells

sperm cells

blood cells

28.

What is one advantage of sexual reproduction?

offspring are identical to parents

offspring are resistant to viruses

offspring are born live, rather than from eggs

offspring inherit a wider variety of genetic information

29.

Term for homozygous organisms that display two dominant phenotypes at the same time

codominance

incomplete dominance

multiple alleles

linked genes

30.

Which is homozygous ?

31.

A plant with a red flower and plant with a white flower cross and create a plant with a pink flower. This is an example of

Codominance

Incomplete dominance

Recessive traits

Homozygous alleles

32.

Which of the following would result in two traits being exhibited at the same time?