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WorksheetsGenetics
Total questions: 17
Worksheet time: 9mins
Name
Class
Date
1.
Which term refers to the physical expression of a gene?
a)
phenotype
b)
genotype
c)
hybrids
d)
generations
2.
Which term refers to an organism’s genetic make-up (combination of alleles)?
a)
phenotype
b)
co-dominance
c)
heterozygous
d)
genotype
3.
Mendel’s Law of _______ states that a random distribution of alleles occurs during gamete formation.
a)
segregation
b)
independent assortment
c)
meiosis
d)
dominance
4.
Which of the following genotypes result in the same phenotype?
a)
AA and AB
b)
BB and Bo
c)
BB and AB
d)
Bo and oo
5.
The letters on the top and side of a Punnett square represent __________.
a)
The chromosome mutation position
b)
The genotype of the offspring
c)
The possible alleles given by the parent following meiosis.
d)
The combination of male and female alleles.
6.
Suppose an animal is heterozygous for two traits (AaBb). Following meiosis, what is the total number of combinations of gametes?
a)
2
b)
4
c)
6
d)
8
7.
Which of the following best explains why it is impossible for males to be carriers for sex-linked traits?
a)
Males can only get the dominant form of sex-linked traits.
b)
Males only have one X chromosome, so there is no second allele to “mask” the recessive form.
c)
Males can only get the recessive form of the trait.
d)
Males have two Y chromosomes, so they don’t have sex-linked traits.
8.
The sickle cell disease can be a genetic advantage if _______ is common.
a)
Cystic fibrosis
b)
Typhoid fever
c)
Malaria
d)
Huntington's disease
9.
If a homozygous tall pea plant and a homozygous short pea plant are crossed
a)
the recessive trait disappears
b)
the offspring are of medium height
c)
no hybrids are produced
d)
all of the offspring are short
10.
The sex chromosomes of a human female are _____.
a)
XX
b)
XY
c)
YY
d)
neither
11.
Carriers do not display the recessive phenotype but are able to pass on an allele for the recessive phenotype to their offspring.
a)
True
b)
False
12.
Carriers can also be described as _____.
a)
homozygous recessive
b)
homozygous dominant
c)
heterozygous
13.
Condition is autosomal dominant
a)
a. Individual I1 is heterozygous for the trait
b)
a. Any child of II5 and II6 will show the trait
c)
a. At least one parent of I2 has the trait
d)
a. Any child of II1 and II2 has a one in two chance of having the trait
14.
The most likely mode of inheritance is:
a)
autosomal recessive
b)
autosomal dominant
c)
x-linked recessive
d)
x-linked dominant
15.
A disease caused by an autosomal primary nondisjunction is
a)
Turner syndrome
b)
Down syndrome
c)
Tay-Sachs disease
d)
PKU
16.
The appearance resulting from a given gene combination is referred to as the
a)
genotype
b)
phenotype
c)
phototype
d)
alleleotype
17.
An individual who has two of the same allele is said to be
a)
homozygous
b)
homologous
c)
heterozygous
d)
diplozygous
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