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 govern a single character |
B. | Codominance | 2. | In a 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 |
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
Which one of the following pairs of features is a good example of polygenic inheritance?
(1) Human height and skin colour
(2) ABO blood group in humans and flower colour of Mirabilis jalapa
(3) Hair pigment of mouse and tongue rolling in humans
(4) Human eye colour and sickle cell anaemia
Match column-I with column-II.
|
Column-I |
|
Column-II |
(a) |
Multiple alleles |
(i) |
Phenylketonuria in humans |
(b) |
Polygenes |
(ii) |
Blood groups in humans |
(c) |
Pleiotropy |
(iii) |
Skin color in human |
1. a-ii, b-i, c-iii
2. a-ii, b-iii, c-i
3. a-iii, b-ii, c-i
4. a-i, b-iii, c-ii
Ability of a gene to have multiple phenotypic effects is known as
1. Co-dominance
2. Pleiotropy
3. Multiple allelism
4. Incomplete dominance
The best example of pleiotropy is:
1. | Skin color | 2. | Phenylketonuria |
3. | Colour Blindness | 4. | ABO Blood group |
How many of the following statements is/are correct for a polygenic inheritance?
(1) They show uniformity.
(2) Controlled by three or more genes
(3) It is not influenced by the environment.
(4) In polygenic inheritance phenotype reflects the contribution of dominant allele only.
Options :
1. 1 and 2
2. 2, 3 and 4
3. 1, 3 and 4
4. only 2
In pea, the gene that controls starch synthesis shows all of the following except
1. Dominance
2. Incomplete dominance
3. Multiple allelism
4. Pleiotropy