Cystic Fibrosis Probability and Genetics

This video tutorial explains how to perform probability calculations using Punnett squares, focusing on cystic fibrosis as an example. It covers genetic inheritance patterns, the use of Punnett squares to determine the probability of genetic traits, and the application of the rules of addition and multiplication in probability. The video also explores advanced scenarios and provides guidance for further learning.

What is the role of the CFT gene in cystic fibrosis?

• It encodes a protein that thickens mucus.

• It encodes a protein that thins the mucus lining of the lungs.

• It is responsible for blood clotting.

• It determines eye color.

In a Punnett square, what is the probability of two heterozygous parents having a child with cystic fibrosis?

• 0%

• 25%

• 75%

• 50%

What is the probability of having a child with cystic fibrosis if both parents are carriers?

• 75%

• 50%

• 25%

• 0%

How do you calculate the probability of mutually exclusive events using a Punnett square?

• By adding their probabilities.

• By subtracting their probabilities.

• By multiplying their probabilities.

• By dividing their probabilities.

What is the probability of two heterozygous parents having a child without cystic fibrosis?

• 75%

• 25%

• 100%

• 50%

What is the probability of having a heterozygous child from two heterozygous parents?

• 75%

• 50%

• 25%

• 100%

What is the probability of having a child with cystic fibrosis and then a child without it?

• 25%

• 18.75%

• 12.5%

• 6.25%

Which rule is used to calculate the probability of sequential events?

• Rule of Addition

• Rule of Subtraction

• Rule of Division

• Rule of Multiplication

If one parent has cystic fibrosis and the other is heterozygous, what is the chance of having a child with cystic fibrosis?

• 75%

• 50%

• 25%

• 0%

What is the probability of having two children with cystic fibrosis if one parent is homozygous recessive and the other is heterozygous?

• 50%

• 25%

• 12.5%

• 75%