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Genetics Review

Total questions: 24

Worksheet time: 31mins

Name
Class
Date
1.
------is the combination of two alleles that are different from one another.
a)
homozygous
b)
heterzygous
c)
phenotype
d)
trait
2.
The letters that make-up the genetic code for a trait
a)
genotype
b)
heterzygous
c)
phenotype
d)
trait
3.
---- Is the combination of two alleles that are the same
a)
genotype
b)
homozygous
c)
phenotype
d)
trait
4.
The physical appearance of the allele combination the offspring receives
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
5.
Black fur (B) is dominant. Find the probability of a black offspring in a cross: bb x bb. 
a)
0%
b)
25%
c)
50%
d)
100%
6.
Look at the Punnett Square. What's the probability of having the recessive offspring?
a)
100%
b)
75%
c)
50%
d)
25%
7.
What are the parents' genotypes?
a)
Homozygous for brown eyes
b)
Heterozygous for brown eyes
c)
Homozygous for blue eyes
d)
Heterozygous for blue eyes
8.

What is the missing genotype?

a)

BB

b)

Bb

c)

bb

9.

The device used to predict genetic outcomes.

a)

Geneticist

b)

Fate

c)

Punnett Square

d)

Pedigree

10.
An organism's phenotype describes its __________.
a)
genetic makeup
b)
physical appearance
11.
How many chromosomes are found in human egg and sperm cells?
a)
20
b)
23
c)
26
d)
46
12.
A dominant trait shows up __________.
a)
only when two dominant alleles are present
b)
only when one dominant allele is present
c)
when at least one recessive allele is present
d)
when at least one dominant allele is present
13.

Study the Punnett Square. What is the probability of having heterozygous dominant traits?

a)

0%

b)

25%

c)

50%

d)

75%

14.

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette. What is the genotype for erminette chickens?

a)

BB

b)

WW

c)

BW

15.

In Andalusian fowls, black individuals (BB) and white individuals (WW) are homozygous. Heterozygous offspring are all bluish-gray. What results if a black individual is crossed with a bluish-gray individual?

a)

0% black

b)

50% blue grey and 50% black

c)

100% black

16.
Who was the father of genetics?
a)
Mendel
b)
Einstein
c)
Redi
d)
Pasteur
17.
If there is a cross of a red and white chicken, and the trait is co-dominant, what will be the result?
a)
a blended color
b)
a speckled chicken
18.
If red and white have incomplete dominance for a trait, and a red flower is crossed with  a white flower, what will be the result?
a)
a spoted flower
b)
a blended flower
19.
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
a)
Incomplete Dominance
b)
Co dominance
20.
What type of inheritance do two alleles have if their traits blend together? 
a)
Incomplete Dominance
b)
Co-Dominance
21.
What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness? 
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
22.
What do the letters inside the boxes of a Punnett Square represent?
a)
the genotypes of the parents
b)
the phenotypes of the parents
c)
the possible genotypes of the offspring
d)
the possible phenotypes of the offspring
23.
What do the letters on the outside of a Punnett Square represent?
a)
the genotypes of the parents
b)
the phenotypes of the parents
c)
the possible genotypes of the offspring
d)
the possible phenotypes of the offspring
24.

In some plants flower color is controlled by incomplete dominance. Some flowers are Blue (B) and some are Yellow (G). Incomplete dominance blends them to make green. What's the genotype for incompletely dominant green flowers?

a)

BB

b)

B'B

c)

B'B'

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