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Semester Review Life Science 4
Test Description: Spring 2013--Part 4 of 6
Instructions: Answer all questions to get your test result.
1) A mating between a purebred purple-flowered pea plant and a purebred white-flowered pea plant would produce a(n) ______.
A
F2 generation
B
hybrid
C
purebred variety
D
P generation
2) Alleles are described as ______.
A
environmental factors that affect gene expression
B
alternate versions of a gene
C
homologous chromosomes
D
alternate phenotypes
3) A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The seeds of all of the offspring are yellow. Why?
A
The yellow allele is dominant to the green allele.
B
The alleles are codominant.
C
The yellow allele is recessive to the green allele.
D
All of the offspring are homozygous yellow.
4) Mendel crossed purebred purple-flowered plants with purebred white-flowered plants, and all of the resulting offspring produced purple flowers. The offspring are all ______,
A
homozygotes... dominant
B
heterozygotes... recessive
C
heterozygotes... dominant
D
homozygotes... recessive
5) What name is given to the collection of physical traits exhibited by an organism?
A
phenotype
B
holotype
C
genotype
D
morphology
6) What is the probability of having offspring with recessive attached earlobes if one parent has attached earlobes & the other is heterozygous for free earlobe?
A
75%
B
0%
C
50 %
D
25%
7) In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?
A
dd
B
DI
C
DD
D
Dd
8) An individual who is homozygous ______.
A
carries two copies of the same allele for a gene
B
expresses the dominant trait
C
expresses the recessive trait
D
carries two different alleles for a gene
9) A couple has two female children. What is the probability that their next child will be male?
A
67%
B
25%
C
33%
D
50%
10) Some individuals have a widow's peak which is dominant (W = dominant allele and w = recessive allele). If Janice has a widow's peak, what is her genotype?
A
ww
B
Ww
C
WW
D
WW or Ww
*select an answer for all questions
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