Chapter 9 Biology Connect study guide

The failure of sister chromatids to separate during meiosis is called

nondisjunction.

Which of the following statements is true?

Chromosomes are classified into two categories: the sex chromosomes that determine gender and autosomes that determine non-gender related traits.

Label the following diagram to explain the role of meiosis in the human life cycle. Place your cursor on the boxes for hints.

Label starts after mitosis it goes Meiosis Egg N and Sperm N Fertilization Zygote 2n Mitosis

Meiosis

Synapsis and Crossing over Occur Dyads are at spindle equator Homologues separate Haploid Daughter nuclei are not genetically identical to parent cell

9. Mitosis

Tetrads are at spindle Equator Sister Chromatids Separate Diploid Daughter nuclei are genetically identical to parent cell

Germ-line cells are haploid but gametes are diploid.

True

A human egg with 22 chromosomes that is fertilized by a normal sperm will result in

a zygote with monosomy.

The human life cycle consists of

adults who are diploid and produce haploid gametes; these gametes fuse to produce a diploid zygote which grows into an adult.

It would be possible for a male and a female to have exactly the same ________, but they would have to differ in ________.

autosomes; sex chromosomes

Which of the following is not a function of meiosis?

cause an organism to grow

Following meiosis I, the daughter cells are ________; following meiosis II, the daughter cells are ________; and following mitosis, the daughter cells are ________.

haploid; haploid; diploid

Complete the following statements about the purpose of meiosis, autosomes, and sex chromosomes. Not all choices will be used.

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The possibility of Down syndrome increases as the mother's age increases because

the possibility of nondisjunction increases.