Crossing Over/Nondisjunction

1.

Multiple Choice

20 sec

1 pt

What is the primary cause of genetic variation during meiosis?

chromosomes lining up

"crossing over" of chromosomes

separation of chromosomes

chromosomes pulling apart

2.

Multiple Choice

20 sec

1 pt

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

anaphase 1

prophase 1

prophase 2

telophase 2

3.

Multiple Choice

20 sec

1 pt

A pair of identical chromosomes (one inherited from mom and one inherited from dad) are called ______________________________.

sister chromotids

centromeres

homologous chromosomes

autosomes

4.

Multiple Choice

30 sec

1 pt

The failure of one or more pairs of homologous chromosomes or sister chromatids to separate "normally" during meiosis is called _____________________.

nondisjunction

anaphase I

nondiploidy

karyotype

5.

Multiple Choice

30 sec

1 pt

This karyotype shows Trisomy 21

This karyotype has no abnormality

This karyotype is missing a sex chromosome (monosomy x)

This karyotype is from a gamete

6.

Multiple Choice

30 sec

1 pt

Based on the Karyotype shown, at which chromosome pair can we identify a genetic disorder?

Chromosome pair 5

sex chromosomes

Chromosome pair 21

There are no chromosomal disorders

7.

Multiple Choice

30 sec

1 pt

Which statement is NOT true about Karyotypes

Chromosomes (pairs 1-22) are arranged by size

Sex chromosomes are found at the end

A normal karyotype has 46 chromosomes or 23 pairs

Having missing or extra chromosomes does not indicate a disorder

8.

Multiple Choice

30 sec

1 pt

What is the chromosomal condition of the individual whose karyotype is seen in the image?

Monosomy X (Turner's Syndrome)

Trisomy 21 (Down's Syndrome)

Trisomy 13 (Patau Syndrome)

Trisomy 18 (Edwards's Syndrome)

9.

Multiple Choice

30 sec

1 pt

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

10.

Multiple Choice

30 sec

1 pt

Nondisjunction can result in

trisomy conditions

monosomy conditions

additional sex chromosomes

all of these

11.

Multiple Choice

30 sec

1 pt

When chromosomes fail to separate correctly during anaphase of meiosis, what can occur?

extra chromosomes are found in the sex cell

chromosomes of the sex cell are doubled

chromosomes of the sex cell are halved

meiosis never completes

12.

Multiple Choice

30 sec

1 pt

Down's syndrome occurs because of a(n)

missing sex chromosome

extra sex chromosome

additional 21st chromosome

additional 18th chromosome

13.

Multiple Choice

30 sec

1 pt

The phase in mitosis where chromosomes move away and are pulled apart by spindles to opposite sides of the cell.

prophase

anaphase

metaphase

telephase

14.

Multiple Choice

30 sec

1 pt

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

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