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Mendelian Genetics Review

Total questions: 25

Worksheet time: 50mins

Name
Class
Date
1.

The instruction of one allele covers up the instruction

of the other allele in a homologous pair. Symbolized by a capital letter.

a)

Recessive Allele

b)

Dominant Allele

c)

Heredity

d)

Trait

2.

A genotype where one dominant and one recessive allele was passed on from both parents for one trait.

Bb Aa Tt Ll

a)

Allele

b)

Homozygous Dominant

c)

Homozygous Recessive

d)

Heterozygous

3.

The observable traits dictated by the genotype

a)

Phenotype

b)

Genotype

c)

Homozygous Recessive

d)

Homozygous Dominant

4.

During meiosis and gamete formation, homologous (paired up) alleles split up

a)

Phenotype

b)

Law of Segregation

c)

Genotype

d)

Dihybrid Cross

5.

During meiosis, the homologous pairs of chromosomes and the matching alleles are lined up independently.

Offspring are a mix of maternal genes and paternal genes.

This increases genetic variation.

a)

Homozygous Dominant

b)

Law of Segregation

c)

Crossing Over

d)

Independent Assortment

6.
If you are homozygous dominant, the genotype would be 
a)
AA
b)
aa
c)
Aa
7.
The letters on the TOP AND SIDE of a punnett square represent ______________.
a)
The combination of alleles in offspring.
b)
The possible alleles given by the parents following meiosis.
c)
The genotype and phenotype of offspring.
d)
The results of genetic mutations in offspring.
8.
The dominant trait in this punnett square is
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
9.
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?
a)
rr
b)

Rr

c)
RR
d)
RR or Rr
10.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
11.
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
12.

What goes in box 3

a)

Aabb

b)

AABB

c)

AAbb

d)

aaBb

13.
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%
14.
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.
15.
Using the dihybrid cross and key provided, what is the probability of the offspring being tall and white?
a)

9/16

b)

1/16

c)

3/16

d)

6/16

16.
Another word for homozygous is...
a)
purebred
b)
hybrid
c)
heterozygous
d)
dominant
17.
If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
TT
b)
Tt
c)
tt
d)
tT
18.
A __________ is a segment of DNA that codes for a particular protein, which leads to a particular trait.
a)
Gene
b)
Allele
c)
Codon
d)
Nucleotide
19.
Which of the following best describes a GENOTYPE?
a)
The allele/genetic makeup of an organism.
b)
The physical expression of a trait.
20.

What is the predicted percentage of homozygous recessive offspring in this cross?

a)

0%

b)

25%

c)

50%

d)

75%

21.
Why do we see only tall plants in the second generation?
a)
The gene for tall height is dominant
b)
The gene for short height is dominant
c)
The gene for tall height is recessive
d)
The parents did not have the tall gene
22.

Who is known as the "father of genetics"?

a)

Charles Darwin

b)

Karl Ernst von Baer

c)

Gregor Mendel

d)

Francis Franklin

23.

In pea plants, tall (T) plant alleles are dominant to short (t) plant alleles. If two tall plants (each with the genotype Tt) are crossed, what is the probability that the cross would result in a short pea plant?

a)

25%

b)

50%

c)

75%

d)

100%

24.

Genes determine the characteristics, or __?__, that an individual can have.

a)

chromosomes

b)

cells

c)

genetics

d)

traits

25.

Patrick Star recently married Patti. He is considered a purebred for his tall head shape (T), which is dominant over a short head (t). If Patti is a short-headed woman, what type of heads would their children have? (HINT: do a Punnett Square on a piece of paper)

a)

75% Tall and 25% short

b)

25% Tall and 75% short

c)

50% Tall and 50% short

d)

100% Tall

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