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Genetics
Test Description: Review
Instructions: Answer all questions to get your test result.
1) The phenotype of an organism
A
cannot be identified
B
describes its physical characteristics
C
is its genetic makeup
D
occurs only in purebred organisms
2) What is an individual that has 2 recessive alleles for the same trait called?
A
haploid for the trait
B
homozygous for the trait
C
heterozygous for the trait
3) If 2 heterozygous parents are crossed, what is the expected phenotype ratio for their offspring?
A
4:1
B
2:1:1
C
1:2:1
D
3:1
4) Pink flowers are a result of crossing red and white flowers, what is this pattern of inheritance called?
A
complete dominance
B
genetic interaction
C
incomplete dominance
D
multiple alleles
5) Why are recessive sex-linked genes expressed more often in males?
A
all male offspring get the recessive gene from their fathers
B
males only receive one gene for that trait
C
males always have two of these genes
D
males inherited these genes from their fathers
6) Mutations that occur in these types of cells could be passed on to the organism without affecting the organism itself?
A
liver cells
B
alveoli
C
egg cells
D
skin cells
7) The expression of a trait such as eye color is influenced by many genes, what pattern of inheritance is this?
A
Codominance
B
Polygenic inheritance
C
Incomplete dominance
D
Complete dominance
8) What is the correct number of chromosomes in humans?
A
1 pair of sex chromosomes and 22 pairs of autosomes
B
2 pairs of sex chromosomes and 23 pairs of autosomes
C
2 pairs of sex chromosomes and 46 pairs of autosomes
D
1 pair of sex chromosomes and 46 pairs of autosomes
9) An organism's genotype is Ttss, which of the following combinations of alleles could have been found in one of the gametes that created this organism?
A
Ss
B
TS
C
Tt
D
Ts
10) What kind of chromosomal mutation is the most harmful?
A
deletion
B
frameshift mutation
C
point mutation
D
substitution
*select an answer for all questions
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