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Genetics Review
Test Description: Questions to help prepare for the genetics test.
Instructions: Answer all questions to get your test result.
1) Which type of trait is expressed (seen) only if BOTH genes code for that trait?
A
dominant
B
phenotype
C
recessive
D
genotype
2) Which type of trait is always expressed (seen), even if only one gene of a pair codes for that trait?
A
recessive
B
dominant
C
genotype
D
phenotype
3) ___ is the physical expression of the genes (how it looks).
A
chromosome
B
homozygous
C
phenotype
D
DNA
4) What do you call one gene of a pair for a SPECIFIC trait?
A
DNA
B
chromosome
C
allele
D
heterozygous
5) What are the structures found in the nucleus that are made of DNA wound around proteins?
A
alleles
B
genes
C
chromosomes
D
genotype
6) Which word means that the genes of a pair are different?
A
heterozygous
B
allele
C
homozygous
D
dominant
7) What is a small piece of DNA that tells a cell how to express a trait?
A
heterozygous
B
chromosome
C
gene
D
dominant
8) What word means that both genes of a pair are alike?
A
homozygous
B
dominant
C
heterozygous
D
recessive
9) Which best represents a genotype?
A
NNn
B
Ab
C
Yy
D
brown hair
10) In dogs, hearing (H) is dominant over deafness (h). If a heterozygous parent is crossed with a homozygous dog that can hear, what is the chance of having a puppy that is deaf?
A
100%
B
25%
C
50%
D
0%
11) Having two different alleles for a trait is said to be ___.
A
phenotype
B
purebred
C
dominant
D
heterozygous
12) What does a capital letter represent in genetics?
A
A hybrid trait
B
A phenotype
C
A recessive trait
D
A dominant trait
13) Which of the following refers to a homozygous dominant trait?
A
Tt
B
AB
C
QQ
D
rr
14) Which of the following refers to a trait that is heterozygous?
A
AB
B
rr
C
QQ
D
Tt
15) If a buffalo has 60 chromosomes in its normal body cells, how many chromosomes will each parent contribute to its baby?
A
120
B
60
C
30
D
not enough information to determine the answer
16) If two heterozygous parents are crossed, what percent of the offspring will show the recessive trait?
A
100%
B
50%
C
75%
D
25%
17) If one parent is GG and the other is gg, what percent of the offspring will show the recessive trait?
A
25%
B
0%
C
50%
D
75%
18) If Huntington's disease (H) is dominant over no disease (n), which genotypes below would have Huntington's disease?
A
HH and Hh
B
all of these answers are correct
C
Hh and hh
D
HH and hh
19) Which genotypes below will show the recessive trait?
A
RR
B
Rr
C
none of these
D
rr
*select an answer for all questions
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