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Mendelian Genetics

Total questions: 15

Worksheet time: 30mins

Name
Class
Date
1.

A version of a gene is called a(n)

a)

allele

b)

characteristic

c)

specific gene

d)

trait

2.

If "T" is the dominant allele for tall and "t" is the recessive allele for short, then what phenotype would "Tt" produce?

a)
tall
b)
short
c)
medium
d)
not enough info
3.


In the Punnett Square below, which genotype belongs in the missing square?

a)
tt
b)
Tt
c)
Bb
d)
TT
4.

In a heterozygous genotype, the ___________ allele is expressed in the phenotype.

a)
recessive
b)
dominant
c)

homozygous

d)

heterozygous

5.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
6.

What is the probability that the offspring will express the dominant trait?

a)

25%

b)

50%

c)

75%

d)

100%

7.

The alleles "tt" is which genotype?

a)

Homozygous Dominant

b)

Heterozygous

c)

Homozygous Recessive

d)

Heterozygous dominant

8.

If a heterozygous tall pea plant is crossed with a short pea plant (recessive), what are the possible genotypes of the future offspring?

a)
100% Tt
b)
50% Tt, 50% tt
c)
75%Tt, 25%tt
d)
25%TT, 50%Tt, 25%tt
9.

If yellow peas are dominant, then a heterozygous yellow pea plant's genotype would be:

a)
YY
b)
yy
c)
Yy
d)
Yg
10.

A phenotype is the ___________ of an organism.

a)

Dominance

b)

Physical appearance

c)

Recessiveness

d)

Alleles / Genes

11.
If green is dominant over purple, then what is the genotype for this individual?
a)
Purple
b)
Green
c)
GG
d)
gg
12.
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.
13.

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

a)

0%

b)

25%

c)

50%

d)

75%

14.
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
15.
Tallness is dominant in pea plants and is represented by "T." What would the genotype be for a homozygous tall plant?
a)
Tt
b)
tt
c)
TT
d)
Tall