Meiosis and Gametogenesis

Which of the following cell types is formed by meiosis?

• muscle cells
• skin cells
• sperm cells
• blood cells

Which cellular process is shown?

• meiosis
• endocytosis
• mitosis
• phagocytosis

Which of the following best describes meiosis?

• It is carried out in all tissues theat require cell replacement
• It occurs only in cells in the reproductive structures of an organism
• It happens in all of the tissues except the brain and spinal cord
• It is the first stage of mitosis

Which best describes the process shown?

• mutation in which the DNA content of the gene is ltered
• segregation of sister chromatids
• condensation and segregation of the alleles
• crossing-over which alleles are exchanged

Which of the following represents chromosome # during fertilization?

• n+n=2n
• n=n
• 2n=n+n
• 2n=2n

Which statement correctly describes meiosis?

• cells divide only once
• meiosis does not occur in reproductive cells
• the cells produced at the end of meiosis are genetically identical to the parent cell
• The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell

Which of the following best explains why the chromosome number is an even number in organisms?

• It is only by coincidence, many organisms have an odd number
• The diploid number is always even so that when mitosis occurs each cell gets the same number of chromosmes
• The diploid chromosome number represents pairs of chromosomes, one from ech parent, so that it is always an even number
• Chromosomes double very time the cell divides, so after the first division, the number is always even

Based only on the sex chromosomes in typical human egg and sperm cells at fertilization, the probability of producing a female is

• 25%
• 50%
• 75%
• 90%

Mendel hypothesized that reproductive cells have only one factor for each inherited trait. This hypothesis is supported by the observation that

• haploid cells are produced by mitosis
• diploid cells are produced by mitosis
• haploid cells are produced by meiosis
• diploid cells are produced by meiosis

If an intestinal cell in a butterfly contains 24 chromosomes, a butterfly egg would contain

• 3
• 6
• 12
• 24