WorksheetsGenetics Review
Total questions: 15
Worksheet time: 14mins
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.
----is the type of gene that always shows itself when present
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
5.
The physical appearance of the allele combination the offspring receives
a)
genotype
b)
homozygous
c)
phenotype
d)
dominant
6.
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%
7.
Look at the Punnett Square. What's the probability of having the recessive offspring?
a)
100%
b)
75%
c)
50%
d)
25%
8.
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
9.
What is the phenotype for the recessive trait?
a)
brown eyes
b)
green eyes
c)
blue eyes
10.
A type of gene that can be hidden is called
a)
genotype
b)
recessive
c)
dominant
d)
allele
11.
A section of the DNA strand that determines a specific trait
a)
gene
b)
trait
c)
chromosome
d)
allele
12.
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
13.
Sickle cell disease (abnormally shaped red blood cells) is a recessive disease in humans. Which gene combination(s) would result in someone being affected by sickle cell disease?
a)
SS
b)
ss
c)
Ss
14.
If red flowers (R) are dominant over white, what is the probability that the offspring will be red?
a)
1 out of 4
b)
2 out of 4
c)
3 out of 4
d)
4 out of 4
15.
What is NOT a possible offspring genotype?
a)
BB
b)
Bb
c)
bb
100 %
