The Cell Cycle

Question 1

What is a common way to look at a chromosome?

Answer 1

• This includes a karyotype (stains and organizes chromosomes to make structure more apparent)

Question 2

What are 3 interesting things that you can see by looking at a karyotype?

Answer 2

1) number of chromosomes is always same for given species (varies between species)
2) in eukaryotes, chromosomes often come in identical pairs = homologs
3) chromosomes duplicate = chromatids

Question 3

Chromatin

Answer 3

Combination of DNA and proteins

Question 4

What is the cause of down syndrome?

Answer 4

Extra chromosome (21)

Question 4

What is the cause of down syndrome?

Answer 4

Extra chromosome (21)

Question 4

What is the cause of down syndrome?

Answer 4

Extra chromosome (21)

Question 5

What are the steps of cell cycle?

Answer 5

The cell cycle is a 4-stage process consisting of Gap 1 (G1), synthesis (S), Gap 2 (G2) and mitosis (M), which a cell undergoes as it grows and divides.

Question 6

What are “cyclins” and “cdks”?

Answer 6

They are proteins that play a central role, concentrations rise and fall and it effects the way the cell moves through

Question 7

what is the connection between cell cycle and cancer?

Answer 7

• cells that stop cycling always arrest in G1
• G1 –> S is critical
• S–> G2 looks for internal signs
• G1–> S looks for external
• uncontrolled cell growth causes cancer