Nondisjunction

Nondisjunction

by HEATHER TILTON

Multiple Choice

A sperm contains

• Both an X and a Y chromosome
• Two X chromosomes
• An X OR a Y chromosome
• only a Y chromosome

Multiple Choice

An egg contains

• 22 autosomes and an X chromosome
• 22 autosomes and an Y chromosome
• 44 autosomes and 2 X chromosomes
• 44 autosomes and an X and a Y chromosome

Multiple Choice

Down's syndrome occurs because of a(n)

• missing sex chromosome
• extra sex chromosome
• additional 21st chromosome
• additional 18th chromosome

Multiple Choice

What would you call the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during meiosis?

• nondisjunction

• anaphase I

• nondiploidy

• karyotype

Multiple Choice

Nondisjunction can result in 

• trisomy conditions
• monosomy conditions
• additional sex chromosomes
• all of these

Multiple Choice

What is the primary cause of genetic variation during meiosis?

• chromosomes lining up

• "crossing over" of chromosomes

• separation of chromosomes

• chromosomes pulling apart

Multiple Choice

The process of "crossing over" occurs in what phase of meiosis?

• anaphase 1

• prophase 1

• prophase 2

• telophase 2

Multiple Choice

Which of the following would be considered a Gamete cell?

• Egg Cell
• Sperm Cell
• Both of these
• None of these

Multiple Choice

The chromosomes that pair up during the first division of meiosis are called __________ chromosomes.

• homozygous

• asexual

• homologous

• genes

Multiple Choice

What is it called when a sperm and egg meet?

• meiosis
• fertilization
• cell division
• mitosis

Multiple Choice

Which process and type of resulting cells are represented?

• mitosis, gametes
• mitosis, body cells
• meiosis, gametes
• meiosis, body cells

Multiple Choice

What kind of cells are made in MEIOSIS?

• Haploid Gametes

• Diploid Somatic Cells

• Skin Cells

• Liver Cells

Multiple Choice

If the Diploid number of Carrots is 18, the haploid number is

• 18
• 9
• 27
• 36

Multiple Choice

What causes genetic variation in meiosis?

• chromosomes lining up

• crossing over of homologous chromosomes

• separation of chromosomes

• chromosomes pulling apart

Multiple Choice

Meiosis makes sperm and egg cells. In humans, sperm and egg cells each have _____ chromosomes. Therefore a fertilized human egg cell (sperm and egg cell combined) would create a cell with _____ chromosomes.

• 23, 46
• 46, 23
• 2, 4
• 50, 100

Multiple Choice

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

• sister chromotids
• centromeres
• homologous chromosomes
• autosomes

Multiple Choice

products of meiosis are genetically

• different
• identical