25. When a homozygous male animal with black fur is crossed with a homozygous female with white fur, they have offspring with gray fur. What type of inheritance does this represent?
a. dosage compensation
b. incomplete dominance
c. multiple alleles
d. sex-linked
28. Cell division in which the sister chromatids fail to separate properly is called
a. multiple alleles.
b. nondisjunction.
c. nonsynapsis.
d. trisomy.
29. When a person’s cells have an extra copy of chromosome 21, it usually results in
a. Down syndrome.
b. Turner’s syndrome.
c. Tay-Sachs disease.
d. Klinefelter’s syndrome.
30. An individual with the chomosomal genotype XYY would be
a. a nearly normal female.
b. a female with Turner’s syndrome.
c. a nearly normal male.
d. a male with Klinefelter’s syndrome.
31. You are a medical researcher trying to create a new antibiotic that will interfere with bacterial DNA replication without harming the eukaryotic host. You have found several chemicals that prevent DNA from unwinding and separating. Which of the following would be the best chemical to use?
a. a chemical that blocks uracil use
b. a chemical that cannot pass into the cell nucleus
c. a chemical that is neutralized by cytoplasm
d. a chemical that works only in the presence of histones
a. dosage compensation
b. incomplete dominance
c. multiple alleles
d. sex-linked
28. Cell division in which the sister chromatids fail to separate properly is called
a. multiple alleles.
b. nondisjunction.
c. nonsynapsis.
d. trisomy.
29. When a person’s cells have an extra copy of chromosome 21, it usually results in
a. Down syndrome.
b. Turner’s syndrome.
c. Tay-Sachs disease.
d. Klinefelter’s syndrome.
30. An individual with the chomosomal genotype XYY would be
a. a nearly normal female.
b. a female with Turner’s syndrome.
c. a nearly normal male.
d. a male with Klinefelter’s syndrome.
31. You are a medical researcher trying to create a new antibiotic that will interfere with bacterial DNA replication without harming the eukaryotic host. You have found several chemicals that prevent DNA from unwinding and separating. Which of the following would be the best chemical to use?
a. a chemical that blocks uracil use
b. a chemical that cannot pass into the cell nucleus
c. a chemical that is neutralized by cytoplasm
d. a chemical that works only in the presence of histones