Bio - Meiosis/Mitosis

After meiosis II the daughter cells will contain ____ chromosomes if the original cell contained 78.

39

telophase 11

A nuclear envelope forms around each set of chromosomes. the cytoplasm divides. nuclear membrane and nuclei reforms.

prophase 11

A second set of spindle forms around the chromosomes

When does replication of chromosomes occur in animal cell meiosis?

Before Meiosis 1 only

Prophase 1

Chromosomes become visible; nuclear envelope breaks down; crossing-over occurs.

metaphase 11

Haploid (half) number of chromosomes line up in the middle of the cell

n cells

Haploid (one set of each chromosome) (meiosis)

A pair of identical chromosomes shown in a karyotype, one inherited from mom, and one inherited from dad are called

Homologous chromosomes

metaphase 1

Paired homologous chromosomes line up across the center of the cell. Chromosome centromeres attach to spindle fibers

synapsis

Pairing of homologous chromosomes

Meiosis II

Sister chromatids separate (cytokinesis) Results in 4 haploid daughter cells with unreplicated chromosomes.

Which statement correctly describes meiosis?

The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell

Telophase 1 (meiosis)

The chromosomes reach the opposite end of cell and cytokinesis begins. The cell divides

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

The diploid chromosome number represents pairs of chromosomes, one from each parent, so that it is always an even number

Which sex chromosomes would indicate a typical human female?

XX

Which sex chromosomes would indicate a typical human male?

XY

2n cells

diploid (two sets of chromosomes) (mitosis)

Which of the following cells is a gamete?

egg

In sexual reproduction, chromosome reduction is necessary to ___.

ensure that all offspring have the correct diploid number of chromosomes

Meiosis is the key process in the production of_________.

gametes

What is one of the advantages to reproducing sexually versus asexually?

genetic variation

The pair of chromosomes that contain the same genes (but may be coded differently) and are inherited from a male and female parent are termed ___.

homologous chromosomes

anaphase 1

homologous chromosomes separate and are pulled to opposite ends of the cell

Which process is necessary for the inherited traits of an organism to be passed along by sexual reproduction?

meiosis

Which of the following produces identical nuclei in cells?

mitosis

Which of the following represents chromosome # during fertilization?

n+n=2n

Meiosis is the

nuclear division of gametes

Which would be considered a somatic cell?

skin cell

anaphase 11

the sister chromatids separate and move toward opposite ends of the cell