IB Biology Topic 10

What is a chiasma?

• A point where homologous chromosomes remain in contact during meiosis

• A point where gene mutations occur

• A point where the recombination of genetic material always occurs

• A process of exchanging genes between non-homologous chromatids

Which response describes the behavior of chromosomes in metaphase I and Anaphase II of meiosis

• A

• B

• C

• D

Humans have a total of how many diploid chromosomes?

• 23 pairs

• 22 pairs

• 48 chromosomes

• 22 individual chromosomes

This is the attachment point between two sister chromatids

• Centromere

• Centriole

• Chromatid

• Chiasma

Tags

NGSS.HS-LS1-4

A homologous pair of chromosomes associates during Prophase I through synapsis and creates a...

• Bivalent

• Non-disjunction event

• New chromosome

• Histone Complex

Identify where this occurs: Each bivalent aligns independently at the equator.

• Metaphase I

• Metaphase II

• Anaphase I

• Anaphase II

Identify where this occurs: Pairs of sister chromatids align at the equator.

• Metaphase I

• Metaphase II

• Anaphase I

• Anaphase II

This image shows...

• Two separate chromosomes

• A bivalent

• One pair of sister chromatids

• Homologous chromosomes

Identify the phase

• Prophase I

• Anaphase II

• Prophase II

• Telophase II

Tags

NGSS.HS-LS1-4

What leads to the vast genetic diversity on our planet? (Select all that apply)

• Crossing over

• Random orientation

• Mutations

• Mitosis

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-2