Free Printable Genetics Review

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Genetics Review

Total questions: 25

Worksheet time: 13mins

Name

Class

Date

A plant with orange flowers was crossed with a plant with blue flowers. All of the offspring have orange flowers. Which of these terms describes the blue flower trait?

Recessive

Dominant

Codominant

Incomplete Dominance

The punnett square shows a cross between two flowering plants. One parent has pink flowers (Pp) and the other parent has white flowers (pp). What percentage of pink flowers will you have?

Chickens can have different types of feathers. Frizzled feathers curl toward a chicken’s head. Assume that feather type is determined by a single gene and that the allele for frizzled feathers is dominant over the allele for straight feathers. In a cross between two chickens with straight feathers, what percentage of the offspring can be expected to have frizzled feathers?

^{_{Scientists learned that the allele for}}^{_{long eyelashes (L) is dominant to the allele for short eyelashes (l), and the allele for strong eye muscles (M) is dominant to the allele for weak eye muscles (m).}}^{_{The Punnett square below show a cross between two of these organisms.}}^{_{What fraction of the offspring will most likely have long eyelashes with weak eye muscles?}}

3/16

9/16

1/16

0/16

The cross of a plant with white flowers (WW) and a plant with Green flowers (ww) is shown in the Punnett square below. What would be the genotype and phenotype of the offspring from this cross?

Ww - white

Ww - green

WW - white

ww - green

What was one contribution Gregor Mendel made to science by performing his experiments on plants?

Showing traits are inherited

Proving that plants are living organisms

Showing that the structure of DNA is a double helix

Proving that random mutations cause the creation of new species

The characteristic for curly hair (C) is dominant to the characteristic for straight hair (c). A cross between two individuals for hair type is shown in the Punnett square below. What must the genotype of the parents be to produce the results shown in the Punnett square?

Homozygous dominant X homozygous dominant

Homozygous dominant X heterozygous

Homozygous recessive X homozygous dominant

Heterozygous X heterozygous

A black cat mates with a white cat and their kittens all come out black and white speckled. This is an example of which of the following?

Dominant

Recessive

Incomplete Dominance

Codominance

The observed trait (physical appearance) that appears in an organism as a result of its genetic makeup is called the organism’s?

Allele

Gene

Genotype

Phenotype

10.

If one parent is homozygous recessive for a butt chin and the other is heterozygous, what is the probability that their children will have a butt chin?

11.

B-blue skin b-green skin E-big ears e-small ears
The phenotype for a boy smurf is homozygous dominant for both traits above. What is his genotype?

BBEE

bbee

BBEe

BbEe

12.

B-blue skin b-green skin E-big ears e-small ears
The phenotype for a girl smurf is homozygous recessive for both traits above. What is her genotype?

bbee

BBEE

BbEe

BBee

13.

So the boy smurf genotype is BBEE and the girl’s genotype is bbee. If they mate what is the genotype of the F1 offspring they produce? Might want to do a punnet square for this question

BbEe

BBEE

BbEE

bbEe

14.

B-blue skin b-green skin E-big ears e-small ears
If the genotype for all the baby smurf’s was BbEe, how many would be green and small eared?

0/16

4/16

8/16

9/16

15.

A plant with white flowers W is crossed with a plant with red flowers (R). The offspring all have pink flowers. This trait is an example of what?

Dominant

Recessive

Codominance

Incomplete Dominance

16.

If you cross a plant with Red flowers (RR) with a plant with pink flowers (RW). How many of the offspring would have Red flowers?

17.

XC- not colorblind Xc- colorblindness allele Color blindness is a sex linked trait, if a woman who is heterozygous (a carrier) for color blindness marries a normal man, what is the probability of one of the son’s being colorblind?

18.

19.

20.

Which of the following traits are not purebred for at least one trait?

BbHh

Bbhh

BBHH

BBHh

21.

Facial dimples and free earlobes are both considered dominant human traits. What are the expected phenotypes of the offspring of a female with dimples and free earlobes (DDFf) and a male with no dimples and attached earlobes (ddff)?

50% with dimples and free earlobes and 50% with dimples and attached earlobes

50% with dimples and free earlobes and 50% with no dimples and attached earlobes

75% with dimples and free earlobes and 25% with no dimples and attached earlobes

75% with dimples and attached earlobes and 25% with no dimples and free earlobes

22.

Normal fruit flies have brownish-yellow bodies, and this body color is dominant. A mutation in the gene for body color can produce flies with an ebony body color. A homozygous normal fruit fly (e+ e+) is crossed with a homozygous ebony fruit fly (ee). What is the predicted outcome of this genetic cross?

All the offspring will have ebony bodies

Of the offspring, 75% will have brownish- yellow bodies, and 25% will have ebony bodies

All the offspring will have brownish-yellow bodies

Of the offspring, 75% will have ebony bodies, and 25% will have brownish- yellow bodies

23.

In humans blood type is determined by the A, B, and O alleles. The A and B alleles are codominant to each other and dominant over the O allele. An individual with the AO genotype and an individual with the BO genotype can produce offspring with which of the following phenotypes?

O only

A or B only

A, B, or O only

A, B, AB, or O

24.

In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having horns (p). What is the expected phenotypic ratio of offspring of a BbPp x BbPp cross if these alleles sort independently?

16 black/polled : 0 black/horned : 0 red/polled

: 0 red/horned

12 black/polled : 0 black/horned : 0 red/polled : 4 red/horned

4 black/polled : 4 black/horned : 4 red/polled : 4 red/horned

9 black/polled : 3 black/horned : 3 red/polled : 1 red/horned

25.

In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel is crossed with a heterozygous black cocker spaniel, which of the following genotypic ratios can be expected.

0 BB: 2 Bb: 2 bb

1 BB: 2 Bb: 1 bb

2 BB: 0 Bb: 2 bb

2 BB: 1 Bb: 0 bb

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Genetics Review

Total questions: 25

Worksheet time: 13mins

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