My Notes
What is the basis of pleiotropy?
1. A spontaneous mutation during the replication of DNA.
2. Interrelationship between various metabolic pathways in the body.
3. Chromosomal aberration as chromosomes are the vehicles of genes.
4. the behaviour of chromosomes during meiosis or gamete formation.
Match the terms in Column I with their description in Column II and choose the correct option.
|
Column I |
Column II |
|
A. Dominance |
1. Many genes govern a single character |
|
B. Codominance |
2. Ina heterozygous organism only one allele expresses itself |
|
C. Pleiotropy |
3. In a heterozygous organism both alleles express themselves fully |
|
D. Polygenic inheritance |
4. A single gene influences many characters |
Codes :
|
|
A |
B |
C |
D |
|
(1) |
2 |
3 |
4 |
1 |
|
(2) |
4 |
1 |
2 |
3 |
|
(3) |
4 |
3 |
1 |
2 |
|
(4) |
2 |
1 |
4 |
3 |
A pleiotropic gene
1. is expressed only in primitive plants
2. is a gene involved during Pliocene
3. controls a trait only in combination with another gene
4. control multiple traits in an individual
Inheritance of skin colour in humans is an example of :
(1) chromosomal aberration
(2) point mutation
(3) polygenic inheritance
(4) codominance
Which one of the following is an example of polygenic inheritance ?
(1) Flower colour in Mirabilis jalapa
(2) Production of male honey bee
(3) Pod shape in garden pea
(4) Skin colour in humans
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