VIII. Population Genetics

Question 1

traits we surveyed during lab?

Answer 1

6 M, R, W, ff, hh, S
mid-digital hair, tongue rolling, widow’s peak, earlobe attachment, hitchhiker’s thumb, and relative finger length

Question 2

Q: What is mid-digital hair and what gene causes it?

Answer 2

hair on the knuckles, caused by the dominant gene M

Question 3

Q: What is tongue rolling and what gene causes it?

Answer 3

ability to fold the tongue to form the letter “U,” caused by the dominant gene R

Question 4

Q: What is a widow’s peak and what gene causes it?

Answer 4

hairline forming a downward point, caused by the dominant gene W

Question 5

Q: What is earlobe attachment and what gene causes it?

Answer 5

attached earlobes are caused by the homozygous recessive gene ff

Question 6

Q: What is hitchhiker’s thumb and what gene causes it?

Answer 6

ability to bend the thumb backward at least 45° or more, caused by the homozygous recessive gene hh

Question 7

Q: What is relative finger length and what gene causes it?

Answer 7

length of the index finger compared to the ring finger
dominant gene S
women: index < ring
men: index > ring

Question 8

Hardy-Weinberg law to find allele frequency?

Answer 8

p + q = 1

where:
p = f of A
q = f of a

Question 9

Hardy-Weinberg law to find genotype frequency?

Answer 9

p^2 + 2pq + q^2 = 1

where:
p^2 = f of AA
2pq = f of Aa
q^2 = f of aa