1. | two closely linked genes on chromosome 16 |
2. | two closely linked genes on chromosome 11 |
3. | a single gene on chromosome 11 |
4. | a single gene on chromosome 16 |
1. | can never be colour blind |
2. | has a 25 per cent chance of being colour blind |
3. | has a 50 per cent chance of being colour blind |
4. | has a 100 per cent chance of being colour blind |
1. | Child 1 | 2. | Child 2 |
3. | Child 3 | 4. | Cannot be determined |
A pea plant shows the dominant phenotype. You conduct a single gene test cross to determine the genotype of this pea plant (T = tall, t = short). All progeny of the test cross show the dominant phenotype. The genotype of the plant in question is most likely:
1. TT.
2. TTtt.
3. Tt.
4. tt.
Column I | Column II | ||
A | Number of possible phenotypes in ABO blood group system | P | 1 : 2 : 1 |
B | Number of possible genotypes in ABO blood group system | Q | 3 : 1 |
C | F2 phenotypic ratio in incomplete dominance | R | 4 |
D | F2 phenotypic ratio in complete dominance | S | 6 |
A | B | C | D | |
1. | P | Q | R | S |
2. | Q | R | S | P |
3. | R | S | P | Q |
4. | S | P | Q | R |