Mitosis Chapter 13

Discipline: Biology (and other Life Sciences)

Type of Paper: Question-Answer

Academic Level: Undergrad. (yrs 3-4)

Paper Format: APA

Pages: 1 Words: 275

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Question

Human gametes are produced by

Meiosis

Normal human gametes carry _____ chromosomes

Which of these cells are haploid?

C and D

A diploid organism whose somatic (nonsex) cells each contain 32 chromosomes produces gametes containing ______ chromosomes

meiosis terminology Drag the labels from the left to their correct locations in the concept map on the right.

a) chromatin b) genes c) chromosomes d) genomes e) traits f) locus g) gametes

This diagram shows a diploid nucleus (2n=8) in which chromosome replication has occurred in preparation for mitosis (top) and meiosis (bottom). The nucleus at top right is now in prophase of mitosis; the nucleus at bottom right is now in prophase I of meiosis.

First, drag blue labels onto blue targets only to identify each stage of the life cycle.
Next, drag pink labels onto pink targets only to identify the process by which each stage occurs.
Then, drag white labels onto white targets only to identify the ploidy level at each stage.

Meiosis creates gametes (eggs and sperm) with only a single chromosome set (haploid or n) from parental cells with two chromosome sets (diploid or 2n). During fertilization, the haploid sperm (n) and egg (n) fuse, producing a diploid zygote (2n). The cells of the zygote then divide by mitosis (which does not change the ploidy level) to produce an adult organism (still 2n) of the next generation.
In sexual life cycles, meiosis and fertilization keep the number of chromosomes constant from generation to generation.

Which statement correctly describes how cellular DNA content and ploidy levels change during meiosis I and meiosis II?

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.