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Mendelian Genetics
Test Description: Test Review
Instructions: Answer all questions to get your test result.
1) In pea plants, inflated pods (R) are dominant to constricted pods (r). Which of the following is a cross between inflated pods and constricted pods?
A
Rr X Rr
B
RR X RR
C
RR X rr
D
RR X Rr
2) In a test cross, if one parent’s genotype is homozygous dominant
A
1/2 of the offspring will have the dominant phenotype
B
3/4 of the offpspring will have the dominant phenotype
C
1/4 of the offspring will have the dominant phenotype
D
all of the offspring will have the dominant phenotype
3) In chickens, rose comb (R) is dominant to single comb (r). A homozygous rose-combed rooster is mated with a single-combed hen. All of the chicks in the F1 generation were kept toge
A
100% rose comb
B
100% single comb
C
75% rose comb and 25% single comb
D
50% rose comb and 50% single comb
4) In mink, brown fur color is dominant to silver-blue fur color. If a homozygous brown mink is mated with a silver-blue mink and 8 offspring are produced, how many would be expected
A
8
B
3
C
0
D
6
5) The typical human body cell contains 46 chromosomes. How many chromosomes are found in a typical human sperm?
A
45
B
46
C
23
D
92
6) A true-breeding tall pea plant is crossed with a true-breeding short pea plant, and all the offspring are tall. What is the most likely genotype of the offspring?
A
Tt
B
tt
C
Tt or tt
D
TT
7) In mice, black is dominant to white color and color is determined by a single gene. Two black mice are crossed. They produce 2 black offspring and one white offspring. If the white
A
50
B
75
C
0
D
25
8) A heterozygous organism is best described as which of these?
A
dominant
B
hybrid
C
true-breeding
D
genotype
9) If two heterozygous individuals are crossed, what percent of their offspring are also expected to be heterozygous?
A
100
B
50
C
75
D
0
10) What is the difference between a monohybrid cross and a dihybrid cross?
A
A dihybrid cross involves crossing two traits and a monohybrid only one trait
B
A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny.
C
A monohybrid cross is performed for one generation, whereas a dihybrid cross is performed for two ge
D
A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.
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