L 13

Question 1

What type of genetic maps are there? (3)

Answer 1

• Genetic/linkage map
• Cytogenic map
• Physical map

Question 2

What is cM as measure for genetic map and how many base pairs does it approximately have

Answer 2

• cM = centimorgans
  1 cM = 1 million base pairs

Question 3

What is a cytogenetic map based on?

Answer 3

It is based on banding pattern of the chromosomes

Question 4

What is a genetic/linkage based on?

Answer 4

It is based on the distance of genes estimated by the crossing over events rate that occurs between these genes

Question 5

What is each arm of a chromosome ( e.g when attached to centromere) called?

Answer 5

• short arm = p (petiteee)
• longs arm = q

Question 6

What is the frequency of crossing over in chromosomes relative to?

Answer 6

• it is relative to the distance between each gene on the same chromosomes
• the closer the gene the LESS frequent the crossing events
• the further the gene from each other , the MORE frequent the crossing over

Question 7

If the recombinant frequency is less than 50% what does that tell us about the gene?

Answer 7

• genes are linked

Question 8

if the recombinant frequency is 50% what does it tell us about the genes?

Answer 8

genes are on different chromosomes OR are far apart in the chromosome