cell cycle

Which of these statements is false?

• At sexual maturity, ovaries and testes produce diploid gametes by meiosis.

• In humans, each of the 22 maternal autosomes has a homologous paternal chromosome.

• In humans, the 23rd pair, the sex chromosomes, determines whether the person is female or male.

• Single, haploid sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid, single-celled zygote.

ANALOGY: Mitosis: somatic cells; Meiosis: __________.

• skin cells

• cancer cells

• gonads

• gametes

If cells in the process of dividing are subjected to colchicine, a drug that interferes with the formation of the spindle fibers, at which stage will mitosis be blocked?

• prophase

• interphase

• anaphase

• metaphase

After telophase, I of meiosis, the chromosomal makeup of each daughter cell is __________.

• diploid, and the chromosomes are each composed of a single chromatid

• diploid, and the chromosomes are each composed of two chromatids

• haploid, and the chromosomes are each composed of a single chromatid

• haploid, and the chromosomes are each composed of two chromatids

Which of the following is a phase of mitosis?

• interphase

• cytokinesis

• S phase

• prophase

. Which of the following is a correct statement about the events of the cell cycle?

• DNA replicates during cytokinesis

• the M Phase is usually the longest phase

• little happens during the G1 and G2 phases

• interphase consists of the G1, S, and G2 phases

Sister Chromatids are ______________

• dense patches within the nucleus

• bacterial chromosomes

• joined strands of duplicated genetic materials

• prokaryotic nucleus

A plant-derived protein known as colchicine can be used to poison cells by blocking the formation of the spindle. Which of the following would result if colchicine is added to a sample of cells in Prophase?

• The cells would immediately die.

• The cells would be unable to begin Mitosis and stay in G2.

• The chromosomes would segregate but in a disorderly pattern.

• The chromosomes would coil and shorten but have no spindle to which to attach.

If an organism has a diploid chromosomes number of 84, what will be the chromosome number of each daughter cells after MITOSIS?

• 84

• 168

• 42

• Cannot be determined

After meiotic cell division, or meiosis, the daughter cells contain __________.

• a random number of chromosomes

• an unknown number of chromosome

• half of the chromosomes of the parent cell

• the same number of chromosomes as the parent cell