Meiosis

Question 1

What type of cells are produced by meiosis?

Answer 1

Hapolid cells

Question 2

Describe the alignment of homologous chromosomes in the fist round of division in meisois

Answer 2

• Homologous chromosomes are paired at the metaphase plate

* Replicated chromosomes align to form a bivalent

Question 3

When do chiasma develop and what is it?

Answer 3

• Prophase 1
• The point of contact between homologous chromosomes
• Known as crossing over

Question 4

What is a Holliday junction?

Answer 4

• They are used to help the cutting process of DNA in crossing over
• 4 sets of double stranded DNA with a centre of single stranded DNA

Question 5

Describe pairing and recombination of sex chromosomes in males

Answer 5

• On the tips of the chromosome, there are pseudoautosomal regions which pair up and act like the rest of the autosome

Question 6

When does crossing over occur?

Answer 6

During prophase 1

Question 7

What is uniparently disomy?

Answer 7

• Two chromosomes come from one parent and none from the other

Question 8

What does genetic distance dictate?

Answer 8

How likely it is that 2 genes will be inherited together (closer=more likely to be inherited together)

Question 9

What can we use recombination frequency for?

Answer 9

To map the genetic distances between genes

Question 10

What is recombination useful for?

Answer 10

Genetic diversity