Gene linkage

Question 1

Why might a phenotypic ratio of 9:3:3:1 not appear?

Answer 1

Chance or genes aren’t passed onto the chromosome

Question 2

Homologous chromosomes

Answer 2

Same gene, same order, different DNA sequence

Question 3

Sister chromatids

Answer 3

Same DNA sequence

Question 4

Homologous recombination

Answer 4

Crossover between non-sister chromatids

Question 5

What is complete linkage?

Answer 5

When 2 parental genes are close together on offspring DNA sequence

Question 6

What is incomplete linkage?

Answer 6

When 2 parental genes are not close together on offspring DNA sequence

Question 7

When can alleles recombine?

Answer 7

When they are far apart as there is more DNA in between

Question 8

How do you calculate recombination frequency?

Answer 8

(Recombinant progeny/total progeny) x 100

Question 9

What is the purpose of recombination frequency?

Answer 9

Relative distance and order between genes

Question 10

When does recombination frequency max out?

Answer 10

50%