Cystic Fibrosis Probability and Genetics

The video tutorial discusses a genetic problem involving a family with a history of cystic fibrosis. It explains how to draw a pedigree chart, calculate the probability of the daughter being a carrier, assess the risk of the couple having a fetus with cystic fibrosis, and determine the probability of the daughter's child having the condition. The tutorial uses Punnett squares and probability rules to solve these genetic questions.

What is the carrier frequency of cystic fibrosis in the Jewish population of Eastern descent?

• 1 out of 10

• 1 out of 25

• 1 out of 50

• 1 out of 100

In a pedigree, what shape represents males?

• Triangle

• Square

• Hexagon

• Circle

What is the probability that the 20-year-old daughter is a carrier of cystic fibrosis?

• 3/4

• 1/4

• 1/2

• 2/3

Why is the probability of the daughter being a carrier 2/3 instead of 1/2?

• Because her parents are carriers

• Because she has a brother with cystic fibrosis

• Because she is married

• Because she is already born and healthy

What is the risk of the couple having another child with cystic fibrosis?

• 1/5

• 1/4

• 1/3

• 1/2

What genetic tool is used to determine the probability of offspring inheriting a trait?

• Pedigree chart

• Punnett square

• Genetic map

• Chromosome chart

What is the probability that the daughter and her husband will have a child with cystic fibrosis?

• 1/250

• 1/200

• 1/150

• 1/100

What is the probability that the daughter is a carrier, given her parents' carrier status?

• 1/4

• 3/4

• 1/3

• 2/3

What is the probability that the daughter's husband is a carrier?

• 1/20

• 1/15

• 1/10

• 1/25

Which rule is used to calculate the probability of both parents passing on a recessive allele?

• Subtraction rule

• Multiplication rule

• Division rule

• Addition rule