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Meiosis And Genetic Crosses
Test Description: Genetic Crosses
Instructions: Answer all questions to get your test result.
1) Which of the following cells is produced by meiosis?
A
ovum (egg cell)
B
muscle cell
C
blood cell
D
nerve cell
2) A fruit fly has 8 chromosomes in its somatic (body) cells. How many chromosomes are in its gametes?
A
23
B
16
C
4
D
8
3) Which of the following results in genetic variation?
A
cloning
B
crossing over and independent assortment
C
mitosis
D
osmosis
4) Which of the following represents fertilization?
A
2n --> n
B
2n + n --> 3n
C
n + n --> 2n
D
2n --> 2n
5) Brown eyes (B) are dominant over blue eyes (b). Which of the following genotypes results in a blue-eyed phenotype?
A
Bb
B
BB
C
BB and Bb
D
bb
6) Why are males most likely to express (show) an X-linked genetic disorder?
A
The Y chromosome is dominant over the X chromosome.
B
The testosterone in males makes them susceptible to genetic disorders.
C
Males carry two X chromosomes.
D
Males carry only one X chromosome, the other sex chromosome is a Y.
7) What is the result of the following cross: Hh x Hh?
A
75% HH, 25% hh
B
100% Hh
C
25% HH, 50% Hh, 25% hh
D
50% Hh, 50% hh
8) The inheritance of one trait does not affect the inheritance of another trait. This is called . . .
A
Fertilization
B
Law of Independent Assortment
C
Pollination
D
Law of Segregation
9) Which of the following is NOT a possible allele combination in the gametes of an individual with the genotype: BbCCDd?
A
bcd
B
bCd
C
BCD
D
BCd
10) Mendel's law of segregation and law of indepedent assortment are supported by the events that occur during ____.
A
Fertilization
B
Pollination
C
Mitosis
D
Meiosis
*select an answer for all questions
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