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Genetics and Heredity Review

Total questions: 42

Worksheet time: 11hrs 30mins

Name
Class
Date
1.

Which of the following is a phenotype?

a)

Aa

b)

red hair

c)

heterozygous

d)

DNA

2.
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?
a)
0%
b)
25%
c)
50%
d)
75%
3.
The genetic information inside an individual.
a)
Homozygous
b)
Heterozygous
c)
Genotype
d)
Phenotype
4.
Having two different alleles for a trait (example Hh):
a)
homozygous
b)
heterozygous
c)
dominant
d)
purebred
5.

In guinea pigs Black fur (B) is dominant to white(b), cross Bb x bb and determine genotypic ratio for offspring

a)

2:2

b)

0:2:2

c)

1:2:1

d)

2:2:0

6.

In pea plants Tall stems (T)are dominant to short stems (t) cross a homozygous tall plant with a homozygous recessive plant, what is the phenotypic ratio

a)

4:0

b)

2:2:0

c)

0:4

d)

0:2:2

7.

Tomato plants usually have hairy stems. Hairless stems are present in tomato plants that are homozygous recessive for this trait. If the stem characteristics are determined by a single gene, what is the expected outcome of crossing two tomato plants that are heterozygous for hairy stems?

a)

75% hairy stems: 25% hairless stems

b)

100% hairy stems

c)

100% hairless stems

d)

50% hairy stems: 50% hairless stems

8.

A partial Punnett square is shown in the image.

Given the offspring in the Punnett Square, what is the most likely genotype of the parents?

a)

Both parents are heterozygous.

b)

Both parents are homozygous dominant.

c)

One parent is homozygous recessive and the other parent is heterozygous.

d)

One parent is homozygous dominant and the other parent is heterozygous.

9.

Hawaiian happy face spiders can have different markings. The pattern allele is dominant to the plain allele. A plain spider is crossed with a homozygous patterned spider. What percentage of the offspring from this cross are expected to be patterned?

a)

0%

b)

25%

c)

50%

d)

100%

10.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
11.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
12.
How many alleles (letters) does a child get from each parent for each trait?
a)
1
b)
2
c)
3
d)
4
13.
In a dihybrid cross
a)
one trait is crossed.
b)
two traits are crossed.
c)
four boxes are needed for the punnett square.
d)
mom's alleles are dominant.
14.

What is the genotype for a pea plant homozygous for round seeds (R), and heterozygous for yellow seeds (Y)?

a)

RrYy

b)

RRyy

c)

RRYy

d)

rryy

15.
What gamete possibilities could come from this parent's genotype?
a)
AB, AB, aB, aB
b)
Ab, AB, Ab, ab
c)
Ab, Ab, Ab, Ab
d)
AB, aB, ab, aB
16.

A parent with genotype YyRR could produce which gametes?

a)

YR, YR, yR, yR

b)

Yy, Rr, yy, rr

c)

Yr, Yr, yr, yR

d)

YR, YR, yr, yr

17.

What genotype would go in box 1?

a)

AABb

b)

AABB

c)

aabb

d)

AaBb

18.

If you cross two homozygous plants (RRYY x rryy)

R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds

What percent will have round and yellow seeds?

a)

0%

b)

25%

c)

50%

d)

100%

19.

A white mouse with red eyes is crossed with a black mouse with brown eyes. The white mouse is recessive for both of its traits. The black mouse is dominant for both of its traits.

This cross would be

a)

BBEE x bbee

b)

BBEe x BbEe

c)

BbEE x BbEe

d)

BBee x BBEE

20.
What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits?
a)
1/16
b)
4/16
c)
8/16
d)
3/16
21.
Which of the following will only show if two alleles are present?
a)
a dominant trait
b)
a recessive trait
22.
Which of the following is a phenotype?
a)
Bb
b)
Black fur
23.
What type of inheritance do two alleles have if their traits blend together? 
a)
Incomplete Dominance
b)
Co-Dominance
c)
Mendelian Inheritance
d)
Homozygous Inheritance
24.
This is an example of ___________?
a)
Incomplete dominance
b)
Co-Dominance
25.
This is an example of ___________.
a)
 Incomplete Dominance
b)
 Codominance
26.
How are Incomplete Dominance and Co Dominance different than a normal Mendelian cross?
a)
There is no difference
b)
The heterozygous genotype has a unique phenotype
c)
There is no heterozygous genotype
d)
There is only one phenotype regardless of genotype.
27.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
28.
A plant shows incomplete dominance in size. A tall plant (TT) is crossed with a medium plant (TS). What fraction of plants will also be tall?
a)
100 %
b)
75%
c)
50%
d)
25%
29.
A roan cow shows co-dominance in fur color (orange and white). What is the phenotype ratio expected if a roan cow and a roan steer mate together?
a)
4: Orange and White
b)
1: Orange : 1 White
c)
2 Orange: 2 Orange and White: 0 White
d)
1: Orange: 2 Orange and White: 1 White
30.
A red flowered plant (RR) breeds with a White flowered plant (WW). The gene for petal color in these plants expresses incomplete dominance.  What percentage of the offspring will have pink (RW) flowers?
a)
0%
b)
25%
c)
50%
d)
100%
31.
Snap dragon color is a incomplete dominant trait.  A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?
a)
Red
b)
Red and White
c)
White
d)
Pink
32.
In chickens, feather color is codominant.  If a black chicken BB is mated with one that is black and white (BW) what are the chances of having a chicken that is black and white?
a)
50%
b)
0%
c)
25%
d)
100%
33.
In Andalusian fowls, black individuals (BB) and white individuals (bb) are homozygous. Heterozygous individuals are grey (Bb).  
Cross a black fowl with a white fowl. What is the phenotype ratio?
a)
4 black: 0 grey: 0 white
b)
2 black: 2 grey: 0 white
c)
0 black: 4 grey: 0 white
d)
0 black: 2 grey: 2 white
34.
In some carnations, flower color exhibits codominance. When crosses, Red (R) and white (W) flowers make speckled flowers (RW) that show both colors.
Complete a cross between 2 speckled flowers and find the genotype ratio.
a)
0 RR: 4 RW: 0 WW
b)
2 RR: 2 RW: 0 WW
c)
1 RR: 2 RW: 1 WW
d)
0 RR: 2 RW: 2 WW
35.
What does a filled in square represent?
a)
Not affected Female
b)
Not affected Male
c)
Affected Male
d)
Affected Female
36.
How many generations are shown in this pedigree?
a)
1
b)
2
c)
3
d)
4
37.
How many kids did the mother and father from the first generation have?
a)
2
b)
4
c)
5
d)
6
38.
What does an open circle represent?
a)
Not Affected Male
b)
Not Affected Female
c)
Affected Male
d)
Affected Female
39.
If a trait SKIPS a generation, it is an indication that the trait is....
a)
dominant
b)
recessive
c)
incompletely dominant
d)
co-dominant
40.

Objective #13

This is a pedigree that follows blue eyes which is a recessive trait. What is the phenotype of the mother (circle) in generation 1?

a)

Brown

b)

Blue

c)

1 blue, 1 brown

41.
How many Homozygous Dominant males are present? 
a)
2
b)
4
c)
6
d)
8
42.
What is the possible genotypes for both children in generation 3? 
a)
BB & BB
b)
Bb & bb
c)
bb & bb
d)
Bb & Bb 

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