Understanding Family Trees and Cystic Fibrosis

This video tutorial explains family trees, focusing on cystic fibrosis, a recessive inherited disorder. It covers how genotypes are represented, the use of family pedigrees, and how to interpret symbols. The video also provides an example of analyzing a family tree and calculating genetic probabilities using Punnett squares. It concludes with a call to action for viewers to like and subscribe.

What is the genetic nature of cystic fibrosis?

• Dominant inherited disorder

• Recessive inherited disorder

• Mitochondrial disorder

• X-linked disorder

How is the healthy allele for cystic fibrosis represented?

• Lowercase c

• Capital F

• Capital C

• Lowercase f

What genotype represents a carrier of cystic fibrosis?

• Lowercase f Lowercase f

• Capital F Capital F

• Capital F Lowercase f

• Capital F Capital C

In a family pedigree, what does a half-shaded shape indicate?

• Unaffected individual

• Unknown status

• Individual with the condition

• Carrier of the condition

What does a circle represent in a family pedigree?

• Child

• Female

• Male

• Carrier

In the family tree example, what is Jenny's genotype?

• Capital F Capital F

• Lowercase f Lowercase f

• Capital F Lowercase f

• Lowercase f Capital F

Who in the family tree example has cystic fibrosis?

• Jenny

• Paul

• Lucy

• Sam's wife

What is the probability of Lucy and Jack's child having cystic fibrosis?

• 75%

• 0%

• 25%

• 50%

What is the purpose of a Punnett square in genetics?

• To diagnose genetic disorders

• To calculate the probability of genotypes

• To determine the family tree structure

• To identify carriers in a pedigree

If both parents are carriers, what is the chance their child will be a carrier?

• 25%

• 0%

• 50%

• 75%