ILT 3 - Meiosis and genetics

Question 1

Homologous chromosome features

Answer 1

• centromere in the same position
• same gene
• same length

• one is inherited from the mother and the other from the father

Question 2

Sister chromatids

Answer 2

Two chromatids from the same chromosome joined by a centromere

Question 3

How do you determine the relative distance between gene loci?

Answer 3

• Determine the frequency of recombination

* the further away, the gene loci, recombination is more frequent

Question 4

What is a test-cross?

Answer 4

a genetic cross between a homozygous recessive individual and a corresponding suspected heterozygote to determine their genotype

Question 5

When does independent assortment occur

Answer 5

When gene loci are linked

Question 6

What would you expect in genotype frequency if gene loci was linked?

Answer 6

Relatively high frequency of two phenotypes and lower frequency of the other 2 phenotypes

Question 7

Is recombination frequency an underestimation or overestimation?

Answer 7

• underestimated

* because double recombinants are missed