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