Multiple Choice (Value 10)
Identify the choice that best completes the statement or answers
the question.
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1.
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How many chromosomes are shown in a normal human karyotype?
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2.
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Which of the following are shown in a karyotype?
a. | homologous chromosomes | c. | autosomes | b. | sex chromosomes | d. | all of the
above |
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3.
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In humans, a male has
a. | one X chromosome only. | b. | two X chromosomes. | c. | one X chromosome and
one Y chromosome. | d. | two Y
chromosomes. |
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4.
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Human females produce egg cells that have
a. | one X chromosome. | c. | one X or one Y chromosome. | b. | two X
chromosomes. | d. | one X and one
Y chromosome. |
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5.
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What is the approximate probability that a human offspring will be
female?
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6.
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What percentage of human sperm cells carry an X chromosome?
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7.
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In a pedigree, a circle represents a(an)
a. | male. | c. | child. | b. | female. | d. | adult. |
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8.
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A pedigree can be used to
a. | determine whether a trait is inherited. | b. | show how a trait is
passed from one generation to the next. | c. | determine whether an allele is dominant or
recessive. | d. | all of the above |
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9.
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Which of the following is caused by a dominant allele?
a. | Huntington disease | c. | Tay-Sachs disease | b. | PKU | d. | none of the
above |
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10.
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Which of the following genotypes result in the same phenotype?
a. | IAIA and
IAIB | c. | IBIB and
IAIB | b. | IBIB and
IBi | d. | IBi and ii |
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Modified True/False (Value 5)
Indicate whether the statement is true or false. If false,
change the identified word or phrase to make the statement true.
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11.
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In a human karyotype, 44 of the chromosomes are autosomes.
_________________________
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12.
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In a human karyotype, 23 chromosome pairs are similar in size and shape.
_________________________
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13.
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In humans, the mother determines the sex of the offspring.
_________________________
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14.
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In a pedigree, if a mother is represented by a shaded circle and a father is
represented by a shaded square, their children can be represented by either shaded or unshaded
circles or squares. _________________________
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15.
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A pedigree showing the inheritance of Huntington disease within a family
would show shaded symbols for people with the disease. _________________________
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Other (Value 5)
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USING SCIENCE SKILLS
The pedigree shows the inheritance of free
earlobes and attached earlobes in five generations of a family. Attached earlobes are caused
by a recessive allele (f). (You may want to draw punnett squares to help with
your answer)
Figure
14–2
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16.
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Inferring Is individual 2 in Figure 14–2 homozygous or heterozygous
for free earlobes? Explain.
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17.
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Interpreting Graphics In Figure 14–2, how many children of
individuals 4 and 5 have attached earlobes?
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18.
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Inferring Can you be certain of the genotype of individual 5 in Figure
14–2? Explain.
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19.
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Predicting Predict the genotype and phenotype of individual 14 in Figure
14–2.
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20.
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Inferring In Figure 14–2, are any of the descendants of individuals
1 and 2 homozygous for free earlobes?
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Essay (Value 2)
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21.
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How might karyotypes be useful to doctors?
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