chapter 4

Question 1

reduction of function

Answer 1

partial loss of function

Question 2

loss of function

Answer 2

(null, amorphic) no function

Question 3

haploinsufficient

Answer 3

loss of function mutation but dominant. phenotype: O/+ (slash in O)

Question 4

gain of function gf

neomorphic

Answer 4

new function, dominant

Question 5

flower color true breeding strains

red x white = red

Answer 5

simple dominant/ recessive

Question 6

red x white = pink

Answer 6

incomplete dominance

Question 7

red x white= red and white patches

Answer 7

codominance

Question 8

abo antigen group

blood type A

Answer 8

I^A I^A or I^Ai

Question 9

blood type B

Answer 9

I^B I^B or I^Bi

Question 10

blood type AB

Answer 10

I^A I^B (co dominant)

Question 11

blood type O

Answer 11

ii. (or OO with slashes)

Question 12

pleiotropy

Answer 12

one gene has many effects on phenotype

Question 13

sex influenced traits

Answer 13

bald male is Aa. but if female was Aa, she wouldnt be bald.

Question 14

this disorder is known to show 75% penetrance if each partner in a couple each had a grandparent with the disorder, what is the prob that their child will be deaf

Answer 14

normal. 1/2 x 1/2 x 1/4= 1/16 but multiple by 3/4.

ans: 3/64

Question 15

redundantly acting genes

Answer 15

either enzyme will do the job

Question 16

two subunits of an enzyme

Answer 16

both required at same step

Question 17

required in series

Answer 17

A step is required for B step