Chapter 13, Problem 6
If you followed a woman's cells through meiosis, at what stage of meiosis would the amount of DNA in one of these cells be equal to the amount of DNA in one of her G1 phase (before DNA replication) kidney cells?
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What proportion of chromosomes in a man's skin cell are maternal chromosomes?
Nondisjunction that leads to problems in offspring can occur in: a. mitosis b. meiosis I only c. meiosis I and II d. mitosis, meiosis I, and meiosis II
Select True or False for each statement. T/F Sister chromatids are homologous chromosomes. T/F Non-sister chromatids are found on two different homologs. T/F Crossing over occurs between sister chromatids. T/F A chiasma forms between two of the four molecules of double-stranded DNA on duplicated homologous chromosomes.
If one species (2n=10) crosses with another species (2n=18), producing an allopolyploid offspring, what is the ploidy of the offspring? a. 2n=10 b. 2n=18 c. 2n=10 + 18=28 d. 4n=36 +20=56
Norway rats have 42 chromosomes in their diploid cells. If such a cell enters meiosis, how many chromosomes and double-helical molecules of DNA will be present in each daughter cell at the end of meiosis II? a. 21 chromosomes and 21 double-helical DNA molecules b. 21 chromosomes and 42 double-helical DNA molecules c. 42 chromosomes and 42 double-helical DNA molecules d. 42 chromosomes and 84 double-helical DNA molecules
Triploid (3n) watermelons, which are seedless, are produced by crossing a tetraploid (4n) strain with a diploid (2n) plant. Explain why this mating produces a triploid individual.