genetics ch 2 mastering

If a typical somatic cell has 64 chromosomes, how many chromosomes are expected in each gamete of that organism? 8 16 32 64 128

32

When cells withdraw from the continuous cell cycle and enter a "quiescent" phase, they are said to be in what phase?

G0 phase

In a healthy male, how many sperm cells would be expected to be formed from (a) 1600; (b) 800 (a) 100; (b) 800 (a) 400; (b) 400 (a) 800; (b) 800 (a) 1600; (b) 1600

(a) 1600; (b) 800

How many chromosomes will be found in each cell after telophase/cytokinesis is completed?

10 chromosomes

How many chromosomes will be found in each cell during prophase?

10 chromosomes

How many DNA molecules will be found in each cell after telophase/cytokinesis is completed?

10 molecules

In a healthy female, how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies would be expected from 100 primary oocytes? 100; 50 200; 300 50; 50 100; 100 200; 50

100:100

How many chromosomes will be found in each cell at the end of anaphase?

20 chromosomes

How many DNA molecules will be found in each cell at the end of anaphase?

20 molecules

How many DNA molecules will be found in each cell during prophase?

20 molecules

The house fly, Musca domestica, has a haploid chromosome number of 6. How many chromatids should be present in a diploid, somatic, metaphase cell?

24 chromatids

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? (Note: Ignore any effects of crossing over.) a. 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. b. DNA content is halved in both meiosis I and meiosis II. Ploidy level changes from diploid to haploid only in meiosis II. c. DNA content is halved only in meiosis I. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II. d. DNA content is halved only in meiosis II. Ploidy level changes from diploid to haploid in meiosis I, and remains haploid in meiosis II. e. DNA content is halved only in meiosis I. Ploidy level changes from diploid to haploid only in meiosis II.

a. 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.

A chromosome that has its centromere located very close to, but NOT on, the end of the chromosome is called a __________. acrocentric chromosome submetacentric chromosome metacentric chromosome telocentric chromosome

acrocentric chromosome

Identify the events that characterize each stage of mitosis: metaphase

centromeres alight on metaphase

Identify the events that characterize each stage of mitosis: anaphase

centromeres split daughter chromosomes migrate to opposite poles

Identify the events that characterize each stage of mitosis: prometaphase

chromosomes are clearly double structures centrioles reach the opposite poles spindle fibers form

Identify the events that characterize each stage of mitosis: prophase

chromosomes coil up and condense centrioles divise and move apart

Identify the events that characterize each stage of mitosis: telophase

daughter chromosomes arrive at the poles cytokinesis commences

Which of the following cell structures are directly involved in protein synthesis? smooth endoplasmic reticulum and the nucleus rough endoplasmic reticulum and ribosomes chloroplasts and mitochondria nucleus and plasma membrane

rough ER and ribosomes

T/F If a typical G1 nucleus is 2n and contains 2C (two complements) of DNA, a prophase I cell is 2n and contains 4C of DNA.

true

The centromere of a chromosome separates during anaphase. True False

true