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Which of the following genotypes result in the same phenotype?
a. I^AI^A and I^AI^B
b. I^BI^B and I^BI^i
c. I^BI^B and I^AI^B
d. I^Bi and ii
If nondisjunction occurs during meiosis,
a. only two gametes may form instead of four
b. some gametes may have an extra copy of some genes
c. centromeres do not form
d. it occurs during prophase
Which of the following are shown in a karyotype?
a. homologous chromosomes
b. sex chromosomes
d. all of the above
Most sex-linked genes are located on
a. the autosomes
b. the X chromosome
c. the Y chromosome
d. both the X chromosome and the Y chromosome
Which of the following is caused by a dominant allele?
a. Huntington's disease
c. Tay-Sachs disease
d. none of the above
Scientists test for alleles that cause human genetic disorders by
a. making karyotypes
b. making DNA fingerprints
c. detecting the DNA sequences found in those alleles
d. making pedigrees
The failure of chromosomes to separate during meiosis is called
b. X-chromosome inactivation
c. Turner's syndrome
d. Down syndrome
Which of the following would you be least likely to see in a pedigree?
a. all of the symbols unshaded
b. all of the symbols are shaded
c. all of the symbols are squares
d. about half of the symbols are circles
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
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
The process of DNA fingerprinting is based on the fact that
a. the most important genes are different among most people
b. no two people, except identical twins, have exactly the same DNA
c. most genes are dominant
d. most people have DNA that contains repeats
In a man with blood type A and a woman with blood type B produce and offspring, what might be the offspring's blood type?
a. AB or O
b. A, B, or O
c. A, B, AB, or O
A human female inherits
a. one copy of every gene located on each of the X chromosomes
b. twice as many sex chromosomes as a human male inherits
c. one copy of every gene locates on the Y chromosome
d. all of the same genes that a human male inherits
Alleles found on the same chromosomes
a. are dominant
b. are never separated by recombination
c. are linked
d. contain repetitive DNA
What is the approximate probability that a human offspring will be female?
Which of the following form(s) a Barr body?
a. the Y chromosome in a male cell
b. the X chromosome in a male cell
c. one of the X chromosomes in a female cell
d. both of the X chromosomes in a female cell
Which of the following can be observed in a karyotype?
a. a change in a DNA base
b. an extra chromosome
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