Free Printable Genetics

Worksheets

Genetics

Total questions: 26

Worksheet time: 1hrs 16mins

Name

Class

Date

In a heterozygous genotype, the ___________ allele takes over in the phenotype.

recessive

dominant

lower case letter

both

T = tall an t = short
What is the phenotype for Tt?

short

tall

medium sized

neither tall or short

In a Punnett square each box represents a(n)....

offspring

parent

gene

trait

The passing of physical characteristics from parent to offspring is __________.

genetics

heredity

genes

traits

outward appearance of an organism, regardless of its genes.

phenotype

genotype

haploid

deploid

What is a phenotype?

The expression of a trait; what you see.

refers to the genetic makeup of an individual

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

the passing of traits from parent to offspring

The inherited combination of alleles is known as the offspring's

heredity

phenotype

genotype

redigree

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

1:3

3:1

1:2:1

2:2

A gene is

a section of DNA

a chemical found in the nucleus of cells

contains instructions for building a protein

all of the above

10.

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

11.

G = green, g = yellow
The genotype for a yellow plant is...

all of the choices result in yellow

12.

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

13.

An allele whose trait only shows up when no dominant allele is present.

hidden allele

dominant allele

recessive allele

present allele

14.

A homozygous dominant dog with brown 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

15.

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

16.

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

17.

Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed? (You'll need to complete a Punnett square)

0 %

25%

50%

75%

18.

The mathematical chance that something will happen is known as...

chance

luck

probability

19.

The different forms of genes are known as

environment

probability

traits

alleles

20.

What is a genotype?

The genetic make up (code)

The physical trait

21.

Which of the following represents a phenotype?

Blue eyes

22.

On a Punnett square, what goes on the top and side of the square?

The genotypes of potential offspring

The phenotypes of potential offspring

The phenotypes of parents

The genotypes of the parents

23.

A Punnett square that calculates the probability for 2 genes has how many squares?

24.

A Punnett square that calculates probability for one gene has how many squares?

25.

trait shows only if both parents pass it on

recessive

dominant

codominan

26.

An organism that has a recessive trait in their genotype, but does not show it in their phenotype is considered what?

A carrier

A mutant

This isn't possible

100 %

Genetics

Total questions: 26

Worksheet time: 1hrs 16mins

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