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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
phenotype
B
genotype
C
recessive
D
dominant
2) Which type of trait is always expressed (seen), even if only one gene of a pair codes for that trait?
A
recessive
B
phenotype
C
genotype
D
dominant
3) ___ is the physical expression of the genes (how it looks).
A
DNA
B
chromosome
C
homozygous
D
phenotype
4) What do you call one gene of a pair for a SPECIFIC trait?
A
heterozygous
B
allele
C
DNA
D
chromosome
5) What are the structures found in the nucleus that are made of DNA wound around proteins?
A
genes
B
chromosomes
C
genotype
D
alleles
6) Which word means that the genes of a pair are different?
A
dominant
B
allele
C
heterozygous
D
homozygous
7) What is a small piece of DNA that tells a cell how to express a trait?
A
chromosome
B
dominant
C
heterozygous
D
gene
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
brown hair
D
Yy
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
25%
B
0%
C
100%
D
50%
11) Having two different alleles for a trait is said to be ___.
A
heterozygous
B
dominant
C
purebred
D
phenotype
12) What does a capital letter represent in genetics?
A
A hybrid trait
B
A recessive trait
C
A phenotype
D
A dominant trait
13) Which of the following refers to a homozygous dominant trait?
A
Tt
B
rr
C
AB
D
QQ
14) Which of the following refers to a trait that is heterozygous?
A
AB
B
Tt
C
QQ
D
rr
15) If a buffalo has 60 chromosomes in its normal body cells, how many chromosomes will each parent contribute to its baby?
A
60
B
120
C
not enough information to determine the answer
D
30
16) If two heterozygous parents are crossed, what percent of the offspring will show the recessive trait?
A
50%
B
75%
C
100%
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
Rr
D
none of these
*select an answer for all questions
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