Lecture 27

Question 1

What does the P gene in flowers do?

Answer 1

controls purple vs white flowers, produces a pigment making enzyme

purple is anthocyanin

Question 2

If there is a single base substitution at splice site such that P turns to p, what happens?

Answer 2

non functional enzyme

Question 3

What is pleiotropy?

Answer 3

One gene influences multiple phenotypic traits, such as anthocyanin gene in pea plants effects flower colour, seed coat, etc

Question 4

What do farmers prefer in crops?

Answer 4

homozygous _ (pure breeding crops)

Question 5

What is incomplete dominance?

Answer 5

heterozygote is intermediate phenotype. Such as pink (red and white)

Question 6

What is codominance

Answer 6

heterozygote has both phenotypes. such as red AND white hair

Question 7

What is standard mendelian inheritance?

Answer 7

3:1, 1:2:1, 9:3:3:1
explained fully by Mendel’s model
complete dominance

Question 8

What is extended mendelian inheritance?

Answer 8

still follows mendel’s laws, but phenotypes differ
incom dom, codom, multiple alleles, pleiotropy

Question 9

What is non-medelian inheritance

Answer 9

not explained by Mendel’s rules

such as genomic imprinting