Quiz about Punnett Squares

Question 1

Homozygous is when...

Accepted Answer

the alleles are the same

Answer

the alleles are different

Answer

the alleles are absent

Answer

the alleles are present

Question 2

Heterozygous is when...

Accepted Answer

the alleles are different

Answer

the alleles are the same

Answer

the alleles are absent

Answer

the alleles are present

Question 3

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

Accepted Answer

dominant

Answer

recessive

Answer

lower case letter

Answer

both

Question 4

T - tall and t = short
In the punnett square below, what belongs in the missing square

Accepted Answer

tt

Answer

Tt

Answer

Bb

Answer

TT

Question 5

B = brown fur b = white fur
In the punnett square, what is the probability for white fur?

Accepted Answer

50%

Answer

0%

Answer

25%

Answer

75%

Question 6

In the punnett square shown, what must the genotype of the missing parent be?

Accepted Answer

Bb

Answer

BB

Answer

bb

Answer

Tt

Question 7

Dominant or recessive?
tt

Accepted Answer

Recessive

Answer

Dominant

Question 8

This image shows a...

Accepted Answer

Punnett Square

Answer

Phenotype

Answer

Genotype

Answer

Dominant allele

Question 9

What does heterozygous mean?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 10

A dog gives birth to 5 puppies. What percentage of the chromosomes does each puppy share with the mother?

Accepted Answer

50%

Answer

25%

Answer

75%

Answer

100%

Question 11

A heterozygous yellow pea plant's genotype would be:

Accepted Answer

Yy

Answer

YY

Answer

yy

Answer

Yg

Question 12

What is a phenotype?

Accepted Answer

The expression of a trait; what you see.

Answer

refers to the genetic makeup of an individual

Answer

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

Answer

the passing of traits from parent to offspring

Question 13

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

Accepted Answer

genotype

Answer

heredity

Answer

phenotype

Answer

redigree

Question 14

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

Accepted Answer

they have same phenotype but different genotypes

Answer

they have same phenotype and genotype

Answer

they have different genotypes and phenotypes

Answer

they have same genotype but different phenotypes

Question 15

True/False: Different genotypes can code for the same phenotype.

Accepted Answer

True

Answer

False

Question 16

Aa, DD, bB, yy are all examples of

Accepted Answer

genotypes

Answer

phenotypes

Question 17

AA and Aa always show up as

Accepted Answer

dominant

Answer

recessive

Question 18

Which of the following genotypes is homozygous dominant?

Accepted Answer

AA

Answer

A

Answer

Aa

Answer

aa

Question 19

Which of the following genotypes is heterozygous?

Accepted Answer

Bb

Answer

BB

Answer

bb

Answer

B

Question 20

What you see, or the physical appearance.

Accepted Answer

Phenotype

Answer

Genotype

Answer

Homozygous

Answer

Heterozygous

Question 21

Which of the following is homozygous recessive?

Accepted Answer

tt

Answer

Tt

Answer

TT

Answer

T

Question 22

Dominant alleles are represented by a:

Accepted Answer

capital letter

Answer

Male gene

Answer

lowercase letter

Answer

recessive trait

Question 23

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

Accepted Answer

gg

Answer

GG

Answer

Gg

Answer

all of the choices result in yellow

Question 24

In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?

Accepted Answer

25%

Answer

0%

Answer

50%

Answer

75%

Question 25

What is the probability of heterozygous offspring?

Accepted Answer

50%

Answer

25%

Answer

0%

Answer

100%

Question 26

What allele combination should go in the missing box?

Accepted Answer

Aa

Answer

AA

Answer

aa

Answer

none of these

Question 27

How many alleles (letters) do each person carry for a trait?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 28

How many alleles (letters) does a child get from each parent for each trait?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 29

Aa is

Accepted Answer

heterozygous

Answer

homozygous

Question 30

Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?

Accepted Answer

25%

Answer

1%

Answer

10%

Answer

0%

Question 31

What is the phenotype of the offspring? (A=brown hair; a=blond hair)

Accepted Answer

75 % Brown Hair and 25% Blond Hair

Answer

50 % Brown Hair and 50% Blond Hair

Answer

25 % Brown Hair and 75% Blond Hair

Answer

0% Brown Hair and 100% Blond Hair

Question 32

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

Accepted Answer

25%

Answer

0 %

Answer

50%

Answer

75%

Question 33

What is the probability of heterozygous offspring?

Accepted Answer

50%

Answer

25%

Answer

0%

Answer

100%

Question 34

In a punnett square where are the parent alleles written?

Accepted Answer

outside of the boxes (top and left side)

Answer

Top and inside the boxes

Answer

Only on the left and right side of the boxes.

Answer

All on the top side of the boxes

Question 35

An allele that is masked when a dominant allele is present. The "weaker" gene.

Accepted Answer

Recessive Allele

Answer

Dominant Allele

Question 36

An allele whose trait always shows up in the organism when the allele is present. The "stronger" gene.

Accepted Answer

Dominant Allele

Answer

Recessive Allele

Question 37

What is called when a organism has  two different alleles for a trait. Tt or Rr

Accepted Answer

Heterozygous

Answer

Homozygous

Answer

Domozygous

Answer

Thermozygous

Question 38

What is called when a organism has two identical alleles for a trait. TT or tt. RR or rr

Accepted Answer

Homozygous

Answer

Heterozygous

Answer

Domozygous

Answer

Thermozygous

Question 39

Punnett squares can be used to predict the probability of:

Accepted Answer

having an inherited disease or a genetically determined physical trait

Answer

being exposed to a contagious disease and contracting it

Answer

Both

Question 40

Scientists use capital and small letters to show the _____ of an organism.

Accepted Answer

<span>genotype</span>

Answer

genetic disorder

Answer

phenotype

Answer

genome

Question 41

An organism that has one dominant and one recessive allele for height is _____.

Accepted Answer

heterozygous

Answer

unusual

Answer

homozygous

Answer

mutated

Question 42

In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being purple?

Accepted Answer

100%

Answer

25%

Answer

0%

Answer

50%

Punnett Squares

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