Ch. 6

Question 1

How many genes can a chromosome carry?

Answer 1

Many hundred to a few thousand

Question 2

What term means two or more genes are located on the same chromosome and are physically linked?

Answer 2

Synteny

Question 3

What is the phenomenon where a gene close to a chromosome tend to be transmitted as a unit?

Answer 3

Genetic Linkeage

Question 4

Genes that are far apart from one another on the chromosome may assort independently via what?

Answer 4

Crossing over

Question 5

How can genetic linkages be altered?

Answer 5

Via crossing over in meiosis

Question 6

Where does crossing over occur in meiosis?

Answer 6

Prophase 1

Question 7

A pair of homologous chromosomes from each parent pair up and become tightly associated, what is this?

Answer 7

Bivalents

Question 8

Offspring that have different allelic combinations than the parents have what?

Answer 8

Recombinant genotypes

Question 9

The likely hood depends on the ____ between genes?

Answer 9

Distance

Question 10

What is preformed to determine the linear order of linked genes along the same chromosome?

Answer 10

Genetic mapping

Question 11

How do you calculate the map distance (mu)

Answer 11

Map distance= (# of recombinant offspring/total # of offspring) 100

Question 12

What equation would you use to determine the possible combinations of offspring?

Answer 12

2^n

Question 13

What genetic recombination occurs least frequently with 3 linked genes?

Answer 13

Double crossover

Question 14

What would allow you to predict the probability of a double crossover?

Answer 14

Product rule

Question 15

What is the phenomenon where one crossover event reduces the likelihood of another crossover occurring nearby resulting in lower than expected number of double cross overs?

Answer 15

Positive interference