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Genetics Middle School

Total questions: 25

Worksheet time: 2hrs 1mins

Name
Class
Date
1.

Which of the following is true about Mendel?

a)

His ideas about genetics apply equally to plants and animals.

b)

He believed that genetic traits of parents will usually blend in their children.

c)

His discoveries concerning genetic inheritance were generally accepted by the scientific community when he published them during the mid 19th century.

2.

Mendel believed that the characteristics of pea plants are determined by the:

a)

inheritance of units or factors from both parents

b)

relative health of the parent plants at the time of pollination

c)

inheritance of units or factors from one parent

d)

a mixing of thing

3.

What were the parents in the P1 generation in Mendel's experiments? Click all that apply.

a)

Homozygous dominant

b)

Heterozygous

c)

Homozygous recessive

d)

Hybrid

4.

What was the phenotype for all of the plants in Mendel's F1 generation?

a)

All dominant trait

b)

All recessive trait

c)

Half dominant and half recessive traits

d)

75% dominant and 25% recessive traits

5.

What was/were the genotype (s) for all of the plants in Mendel's F2 generation?

a)

All homozygous dominant

b)

All homozygous recessive

c)

All heterozygous

d)

25% homozygous dominant, 50% heterozygous and 25% homozygous recessive traits

e)

50% heterozygous, 50% homozygous recessive

6.

What was/were the phenotype (s) for all of the plants in Mendel's F2 generation?

a)

All dominant trait

b)

All recessive trait

c)

Half dominant and half recessive traits

d)

75% dominant and 25% recessive traits

7.

Indicate whether the genotype is heterozygous or homozygous - GG

a)

homozygous

b)

heterozygous

8.

Indicate whether the genotype is heterozygous or homozygous - Bb

a)

homozygous

b)

heterozygous

9.

Indicate whether the genotype is heterozygous or homozygous - nn

a)

homozygous

b)

heterozygous

10.

Purple flowers are dominant to white. Given a genotype of Pp determine the phenotype.

a)

purple

b)

white

11.

Bobtails are recessive (long tails dominant). Given a genotype of tt determine the phenotype.

a)

long tail

b)

bobtail

12.

Straight hair is dominant to curly. List the possible genotypes for straight hair. Click all that apply.

a)

SS

b)

Ss

c)

ss

13.

In pea plants purple flowers are dominant to white flowers. If two white flowered plants are cross, what percentage of their offspring will be white flowered? ______

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

14.

Set up the square for the crosses listed below. The trait being studied is round seeds (dominant) and wrinkled seeds (recessive). Rr X rr What is the percentage of offspring that will be round?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

15.

Punnett squares are used by geneticists to determine the probability of different offspring genotypes. In the one shown below, what letter(s) belong in the lower right box?

a)

AA

b)

Aa

c)

aa

16.

Punnett squares can be used to predict the probability of:

a)

being exposed to a contagious disease and contracting it

b)

having an inherited disease or a genetically determined physical trait

c)

both of the above

17.

If two people who are both carriers (which means they are heterozygous) for a genetically inherited fatal recessive disease decide to become parents, what will be the odds that their children will also be carriers (again this means heterozygous)?

a)

1 out of 4

b)

2 out of 4

c)

3 out of 4

d)

4 out 4

18.

In guinea pigs, the allele for short hair is dominant. What genotype would a heterozygous short haired guinea pig have?

a)

SS

b)

Ss

c)

ss

19.

OOmpas generally have gray faces, which is caused by a dominant gene. The recessive condition results in an orange face. A gray faced OOmpah (homozygous) is married to an orange faced Oompah. They have 8 Oompah children. How many of those children will have gray faces?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

20.

OOmpahs can have red (R), blue (B), or purple hair. The allele that controls this trait is INCOMPLETELY DOMINANT, where purple hair is caused by the heterozygous condition. What is the probability of having a purple haired baby from two parents that are both purple haired?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

21.

If a woman is homozygous normal and her husband is heterozygous for a genetically inherited recessive disease and they decide to become parents, what is the probability that they will have a healthy child?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

22.

If two parents are heterozygous for a genetically inherited dominant trait, what is the probability that they will have a child together who has this trait in his or her phenotype?

a)

0%

b)

25%

c)

50%

d)

75%

e)

100%

23.

When a capital letter is used, what kind of allele is most often being represented?

a)

recessive allele

b)

codominance

c)

punnett square

d)

dominant allele

24.

If a heterozygous chicken has both black and white feathers, they have neither a dominant or recessive trait, and both alleles express themselves independently in the phenotype. What is this called?

a)

A black and white chicken

b)

Incomplete dominance

c)

Complete dominance

d)

Codominance

25.

A heterozygous chicken with both black and white feathers, mates with a rooster that is homozygous for black. What are the possible offspring these parents can have, giving both the genotype and the phenotype.

a)

100% All black and white chickens

b)

50% black and white and 50% black chickens

c)

50% black and white and 50% white chickens

d)

100% white chickens