Inbreeding Coefficient and Probability

The video tutorial explains the concept of the inbreeding coefficient, which is the probability that an individual will have two identical alleles inherited from a common ancestor. The instructor uses a pedigree to identify the common ancestor and demonstrates how to calculate the probability of inheriting identical alleles, both dominant and recessive. The tutorial also introduces a shortcut method for calculating the inbreeding coefficient more efficiently. The video concludes with a summary and a prompt to subscribe for more lessons.

What is the inbreeding coefficient?

• The probability of inheriting alleles from unrelated individuals.

• The probability of inheriting identical alleles from a common ancestor.

• The probability of inheriting dominant alleles only.

• The probability of inheriting different alleles from ancestors.

Who can be a common ancestor in a pedigree?

• Only the paternal grandfather.

• Only the maternal grandmother.

• An ancestor who can pass the same allele from both sides.

• Any ancestor from either side of the family.

Why can't the great-grandfather be a common ancestor?

• He can only pass alleles through one side.

• He can pass alleles through both sides.

• He has no alleles to pass.

• He is not related to person A.

What is the probability of the great-grandmother passing a dominant allele to her son?

• 1/4

• 1/3

• 1

• 1/2

How many times is the probability 1/2 multiplied in the calculation?

• 4 times

• 5 times

• 7 times

• 6 times

What is the probability of person A having two identical alleles from the common ancestor?

• 1/16

• 1/64

• 1/8

• 1/32

How do you calculate the inbreeding coefficient?

• By dividing probabilities of identical alleles.

• By adding probabilities of identical alleles.

• By multiplying probabilities of different alleles.

• By subtracting probabilities of different alleles.

What is the shortcut method for calculating the inbreeding coefficient?

• Counting the number of alleles.

• Counting the number of ancestors.

• Counting the number of nodes excluding the person of interest.

• Counting the number of generations.

How many nodes are counted in the shortcut method?

• 6

• 5

• 4

• 3

What is the final inbreeding coefficient calculated using the shortcut method?

• 1/8

• 1/64

• 1/32

• 1/16