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Yr 11 Bio - Genetics

Total questions: 56

Worksheet time: 3hrs 48mins

Name

Class

Date

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

A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?

25%

50%

75%

What is the probability of heterozygous offspring?

25%

50%

100%

What allele combination should go in the missing box?

none of these

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?

RR or Rr

What is the phenotype of the offspring? (A-Brown hair; a-blond hair)

50 % Brown Hair and 50% Blond Hair

25 % Brown Hair and 75% Blond Hair

75 % Brown Hair and 25% Blond Hair

0% Brown Hair and 100% Blond Hair

If a heterozygous parent and a homozygous recessive parent mate, what percentage of their offspring will be dominant?

25%

50%

75%

100%

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

0 %

25%

50%

75%

What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?

0 in 4

1 in 4

2 in 4

4 in 4

10.

B - black, b - brown. Two black mice mate and have some black and some brown mice. What is the genotype of the parents?

BB x Bb

BB x bb

Bb x Bb

Bb x bb

11.

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%

12.

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 white?

25%

100%

50%

13.

Purple (P) is dominant to the white (p).
According to the Punnett Square, what is the probability of an offspring being purple?

25%

100%

50%

14.

What is the yellow seed genotype?

AA or Aa

15.

What is the dominant trait?

yellow pea seeds

green pea seeds

there is no dominant seed

Jolly green giant

16.

What does a Punnett Square do?

tell you exactly what your offspring will look like

increase the chance you pass on recessive traits

predict genotypes and phenotypes in offspring

have no purpose but for Taylor to give us extra assignments

17.

What genotype would go in box 3?

18.

What genotype would go in box 1?

19.

Which of the following is homozygous dominant?

20.

Which of the following is homozygous recessive?

21.

This is an example of ___________?

Incomplete dominance

Co-Dominance

22.

This is an example of ___________.

Incomplete Dominance

Codominance

23.

What type of inheritance do two alleles have if their traits blend together?

Incomplete Dominance

Co-Dominance

24.

A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?

Incomplete Dominance

Co dominance

25.

This is an example of ___________.

Incomplete Dominance

Codominance

26.

A tall plant (TT) is crossed with a short plant (SS) and a medium plant (TS) results. This is what type of inheritance pattern?

Incomplete Dominance

Codominance

27.

This type of inheritance pattern is a MIXTURE of both traits.

incomplete dominance

co-dominance

complete dominance

28.

How are Incomplete Dominance and Co Dominance different than a normal Mendelian cross?

There is no difference

The heterozygous genotype has a unique phenotype

There is no heterozygous genotype

There is only one phenotype regardless of genotype.

29.

When one allele is not dominant over the other, resulting in both traits expressed in a heterozygous individual.....

Incomplete Dominance

Codominance

30.

When one allele is not dominant over another, resulting in a blended phenotype for heterozygous offspring is considered....

Incomplete Dominance

Codominance

31.

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).

Cross a red flower with a speckled flower. What is the phenotypic ratio?

2 red, 2 speckled

2 red, 2 blue

2 blue, 2 speckled

32.

Some flowers are controlled by codominance. Red flowers (RR), blue flowers (BB) and Speckled flowers (RB).

Cross two speckled flowers.

1 red, 2 speckled, 1 blue

2 red, 2 blue

2 blue, 2 speckled

1 red, 1 speckled, 2 blue

33.

this image is an example of

codominance

dominance

incomplete dominance

34.

In the image above, what is the percentage of the offspring has the possibility of inheriting blood type O?

25%

50%

100%

35.

In the image above, the trait for flower color is controlled by codominance. R codes for red flowers and W codes for white flowers. Which of the following correctly reports the phenotypes?

100% red flowers

50% white flowers and 50% pink flowers

50% red flowers and 50% red and white flowers

50% white flowers and 50% red flowers

36.

The image above shows the incomplete dominant cross where B codes for red flowers and b codes for white flowers. What are the phenotypes of the parents?

a red flower and a white flower

a red flower and a pink flower

a white flower and a pink flower

two red flowers

37.

The image above shows the incomplete dominant cross where D codes for straight hair in dogs and d codes for curly hair in dogs. The incomplete dominant trait is wavy hair. Which of the following statements is true about the offspring?

Only the heterozygous genotype can code for wavy hair.

Only the homozygous dominant genotype can code for wavy hair.

Only the homozygous recessive genotype can code for wavy hair.

The homozygous recessive and homozygous dominant genotypes can code for wavy hair.

38.

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

39.

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

one

two

three

five

40.

The sex of a child is determined by

whether the father's sperm contains an x or y chromosome

whether the mother's egg contains an x or y chromosome

the age of the parents

41.

An individual's sex is determined by

1 of 23 chromosomes

2 of 46 chromosomes

4 of 92 chromosomes

42.

Why is the gene for a disease or disorder more likely to be found on the X chromosome than Y?

The X chromosome has many more genes

The Y chromosome has many more genes

43.

Males are more likely to suffer from a sex-linked disease or disorder because

males are the weaker sex

males have less DNA

males have 1 X chromosome, so the disorder is more likely to be expressed

44.

When we say that a woman is a carrier for a genetic disease or disorder it means that

she has 1 gene, but not the disorder

she has 2 genes for the disorder

she can pass the gene only to male children

she can pass the gene only to female children

45.

Why are men 16 times more likely to be color-blind than women?

to be color-blind, you must have a Y chromosome

to be color-blind, all of your X chromosomes must have the gene

color-blindness is caused by testosterone

color-blindness is caused by the same gene as baldness

46.

If a gene is found only on the X chromosome and not the Y chromosome, it is said to be

sex-linked trait

polygenic trait

codominant trait

incomplete dominance trait

47.

Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?

X^HX^h

X^hX^h

X^HX^H

X^hY

48.

Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?

X^HX^h

X^hX^h

X^HY

X^hY

49.

In fruit flies, eye color is a sex linked trait. Red (R) is dominant to white (r). What is the sex and eye color of flies with the following genotype: X ^R X ^r?

male with white eyes

female with red eyes

male with red eyes

female with white eyes

50.

Look at this cross: X^BX^B x X^bY

What proportion/percent of the male children are colorblind?

100%

75%

25%

51.

H= normal blood clotting

h=hemophilia

X^HX^h x X^HY

What is the probability that any of their offspring will have hemophilia?

4/4

3/4

2/4

1/4

52.

Hemophilia is a sex-linked recessive disorder. A woman with hemophilia marries an unaffected man whose father had hemophilia. What percentage of their daughters will have hemophilia?

25%

50%

100%

53.

Colorblindness is a sex-linked recessive disorder. A normal woman whose father was colorblind marries a man with normal color vision. What percentage of their sons will be colorblind?

25%

50%

100%

54.

What percentage of the female offspring will be a carrier for this recessive disease?

50%

100%

25%

55.

Colorblindness is a recessive x-linked disorder.
Which genotype represents a male with normal vision?

X^NX^N

XⁿXⁿ

X^NY

XⁿY

56.

Which of the following genotypes belongs in the red box in the Punnett square?

X^BX^b

X^bX^b

X^bY

X^BY

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Yr 11 Bio - Genetics

Total questions: 56

Worksheet time: 3hrs 48mins

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