The development of eyes has been intensively studied. Eyes of vertebrates and insects are
A. analogous (homoplastic), not homologous, yet the same Pax6 gene initiates development.
B. homologous, not analogous (homoplastic), yet the same Pax6 gene initiates development.
C. analogous (homoplastic), not homologous, and development is initiated by two different genes, Pax6 and Pax7.
D. homologous, not analogous (homoplastic), and development is initiated by two different genes, Pax6 and Pax7.
A. analogous (homoplastic), not homologous, yet the same Pax6 gene initiates development.
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Suppose an individual is heterozygous for alternate alleles of gene A (Aa). Under what conditions would a crossover in a somatic cell of this individual lead to a clone of cells that are homozygous for a? (Pick the most precise answer.)
A) The crossover would have to occur between the A locus and the centromere and involve two homologous (nonsister) chromatids. B) The crossover would have to occur between the A locus and the end of the chromosome and involve two homologous (nonsister) chromatids. C) The crossover would have to occur between the A locus and the end of the chromosome and involve two nonhomologous chromosomes. D) The crossover would have to occur between the A locus and the centromere and involve two sister chromatids.
A diploid cell has how many versions of each gene?
a. 1 b. 2 c. 4 d. 8 e. 16
The mitochondrial genomes usually consist of
a. a single linear DNA molecule. b. several linear DNA molecules. c. circular DNA molecules. d. None of the above—mitochondria do not have a genome.
Which form of hepatitis can lead to fulminant hepatitis in its acute form?
a) Hepatitis A b) Hepatitis B c) Hepatitis C d) Hepatitis D