Chapter 16

Question 1

What do double lines in a pedigree mean

Answer 1

mating between relatives

Question 2

how do you tell if a trait is dominant in a pedigree

Answer 2

an affected individual will show up in every generation

Question 3

how do you tell if a trait is recessive in a pedigree

Answer 3

an affected individual will show up in every other generation

Question 4

compare the X chromosome and the Y chromosome

Answer 4

the X chromosome is more than 150 Mb long and the Y chromosome is only about 50 Mb long. Most genes in the X chromosome have no counterparts in the Y chromosome

Question 5

describe gene linkage

Answer 5

when genes are close together on the same chromosome they are linked

Question 6

what does crossing over between 2 genes result in

Answer 6

2 recombinant and 2 nonrecombinant chromosomes

Question 7

what happens if crossing over occurs but not between 2 genes

Answer 7

the result is 4 non recombinant chromosomes

Question 8

What happens if segment A is close to segment B on a chromosome

Answer 8

the chances of crossing over occurring is very low

Question 9

what happens if segment B is close to segment A on a chromosome

Answer 9

the chances of crossing over occurring is very high

Question 10

how do you determine the frequency of recombination

Answer 10

the sum of distances between genes on a chromosome