Multiple Choice Questions

What must happen to a chromosome before a cell starts mitosis?
  • It is present in every somatic cell of males and females.
  • There would be less genetic variation among gametes.
  • The single DNA molecule in the chromosome must be replicated.
  • Prophase, prometaphase, metaphase, anaphase, and telophase
Which of the following statements is correct regarding the human X chromosomes?
  • It is present in every somatic cell of males and females.
  • - Independent assortment of chromosomes in meiosis- Crossing over- Random fertilization
  • Prophase, prometaphase, metaphase, anaphase, and telophase
  • Alignment of the chromosomes at the equator
At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
  • Metaphase
  • Telophase I
  • Metaphase II
  • Telophase II
The parent cell that enters meiosis is diploid, whereas the four daughter cells that result are haploid. Which statement correctly describes how cellular DNA content and ploidy levels change during meiosis I and meiosis II?
  • Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication.
  • DNA content is halved in both meiosis I and meiosis II. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II.
  • It is present in every somatic cell of males and females.
  • - Independent assortment of chromosomes in meiosis- Crossing over- Random fertilization
If crossing over did not occur, which of the following statements about meiosis would be true?
  • It is present in every somatic cell of males and females.
  • Prophase, prometaphase, metaphase, anaphase, and telophase
  • There would be less genetic variation among gametes.
  • The single DNA molecule in the chromosome must be replicated.
How are sister chromatids and homologous chromosomes different from each other?
  • - For prenatal screening, to determine if a fetus has the correct number of chromosomes.- To determine whether a fetus is male or female.- To detect the possible presence of chromosomal abnormalities such as deletions, inversions, or translocations.
  • Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication.
  • - Independent assortment of chromosomes in meiosis- Crossing over- Random fertilization
  • It is present in every somatic cell of males and females.
What number and types of chromosomes are found in a human somatic cell?
  • 44 autosomes and 2 sex chromosomes
  • Alignment of the chromosomes at the equator
  • It is present in every somatic cell of males and females.
  • The single DNA molecule in the chromosome must be replicated.
A diploid organism whose somatic (nonsex) cells each contain 32 chromosomes produces gametes containing _____ chromosomes.
  • Telophase I
  • Metaphase
  • 23
  • 16
Which of these cells is (are) haploid?
  • Once meiosis I is completed, cells are haploid.
  • Prophase, prometaphase, metaphase, anaphase, and telophase
  • Alignment of the chromosomes at the equator
  • It is present in every somatic cell of males and females.
Many organisms spend most of their life cycle in the diploid state. If meiosis produces haploid cells, how is the diploid number restored for these types of organisms?
  • Telophase II
  • Telophase I
  • Fertilization
  • Metaphase
For what purpose(s) might a karyotype be prepared?
  • Homologous chromosomes contain the same gene loci but may have different alleles of a particular gene. Sister chromatids are identical copies of each other produced during DNA replication.
  • The single DNA molecule in the chromosome must be replicated.
  • - For prenatal screening, to determine if a fetus has the correct number of chromosomes.- To determine whether a fetus is male or female.- To detect the possible presence of chromosomal abnormalities such as deletions, inversions, or translocations.
  • - Independent assortment of chromosomes in meiosis- Crossing over- Random fertilization
Human gametes are produced by...
  • Meiosis
  • Prophase II
  • Anaphase II
  • Mitosis
Normal human gametes carry _____ chromosomes.
  • 23
  • Meiosis
  • 16
  • Prophase II
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Multiple Choice Questions
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