2b- Chromosomal Mutation Review

Variation During Meiosis

Multiple Choice

What is nondisjunction?

• When a segment of a chromosome breaks off.

• When a segment of a chromosome breaks off, flips, and reattaches.

• When a segment of a chromosome is copied or doubles.

• When a segment of a chromosome breaks and attaches to a non homologous chromosome.

• When entire chromosomes don't separate evenly during meiosis.

Multiple Choice

Notice the abnormal 23rd chromosome. This individual has an extra X chromosome. What type of mutation is this?

• Translocation

• Nondisjunction

• Dublication

• Inversion

• Deletion

Multiple Choice

What is the result of nondisjunction?

• Deletion of genes on chromosome 4

• The wrong number of chromosomes in the gametes

• Increased variation of genes with no chance of disorders

• More recessive traits expressed.

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

Crossing over occurs during prophase I of meiosis. Which statement about crossing over is true?

• RNA translation occurs in the smooth endoplasmic reticulum

• Crossing over takes place in backterial cells

• Crossing over produces genetically identical daughter cells

• Crossing over provides genetic diversity in eukaryotic cells

Multiple Choice

What does the image demonstrate

• Punnet squares

• Crossing over

• Metaphase

• Dna replication

Multiple Choice

During prophase I crossing over occurs and genetic material is exchanged between homologous chromosomes. How is this important

• Increases genetic variation

• Reduces the diploid number to the haploid number

• Increases the haploid number to the diploid number

• Reduces the probability of mutations