Lecture 3e: Allelic Interactions

Question 1

different types of dominance

Answer 1

1. complete dominance
2. incomplete dominance
3. codominance
4. allelic complementation
5. overdominance
6. complex dominance

Question 2

In complete dominance, heterozygotes exhibit dominant trait with __ genotypic ratio and __ phenotypic ratio

Answer 2

• 1: 2: 1
• 3: 1

Question 3

Phenotype of the heterozygote is the same as homozygous dominant

Answer 3

Complete dominance

Question 4

In complete dominance, recessive phenotype is expressed only when the organism is __

Answer 4

homozygous recessive

Question 5

F1s are intermediate between two parents; recessive gene interferes in the expression of a dominant trait.

Answer 5

incomplete dominance

Question 6

Recessive allele is not expressed in heterozygote

Answer 6

Incomplete dominance

Question 7

Observed only in heterozygotes with dissimilar genes

Answer 7

allelic interactions

Question 8

placing molecules in a high voltage field; separation accdg to size, net charge

Answer 8

gel electrophoresis

Question 9

IA and IB are __ to i.
IA and IB are __ to each other.

Answer 9

• dominant
• codominant

Question 10

Similar to codominance but the different interaction between two alleles results in the production of a hybrid protein

Answer 10

allelic complementation

Question 11

partial or incomplete complementation among mutant alleles of a gene, representing different cistrons

Answer 11

allelic complementation

Question 12

overdominance is also known as

Answer 12

heterosis or hybrid vigor

Question 13

hybrid is superior to both parents; also __ genotypic ratio

Answer 13

overdominance
- 1:2:1

Question 14

very useful in plant/animal breeding

Answer 14

overdominance

Question 15

Dominance relationships can be very complex

Answer 15

complex dominance