Question:
Find the correct statement.
(1) Generally, a gene regulates a trait but sometimes one gene has effect on multiple traits.
(2) The trait AB-blood group of man is regulated by one dominant allele and another recessive allele. Hence it is co-dominant.
Find the correct statement.
(1) Generally, a gene regulates a trait but sometimes one gene has effect on multiple traits.
(2) The trait AB-blood group of man is regulated by one dominant allele and another recessive allele. Hence it is co-dominant.
(1) Generally, a gene regulates a trait but sometimes one gene has effect on multiple traits.
(2) The trait AB-blood group of man is regulated by one dominant allele and another recessive allele. Hence it is co-dominant.
Show Hint
Co-dominance means "partners in crime"—both alleles show up equally. In AB blood, both A and B antigens are present on the red blood cell surface because neither allele can mask the other.
Updated On: Apr 24, 2026
- Statement (2) is correct.
- Both statements (1) and (2) are correct.
- Both the statements are wrong.
- Statement (1) is correct.
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
This question tests the definitions of Pleiotropy and Co-dominance. Pleiotropy occurs when one gene influences multiple phenotypic traits. Co-dominance occurs when two different alleles are both fully expressed in the phenotype.
Step 2: Detailed Explanation:
1. Statement 1: This is the definition of Pleiotropy. For example, in Phenylketonuria, a single gene mutation leads to mental retardation, reduced hair, and skin pigmentation. This statement is correct.
2. Statement 2: The AB blood group is indeed an example of co-dominance, but the explanation is wrong. It is regulated by two dominant alleles ($I^A$ and $I^B$), not one dominant and one recessive. $I^O$ (or $i$) is the recessive allele in the ABO system. This statement is incorrect.
Step 3: Final Answer
Only Statement (1) is correct.
This question tests the definitions of Pleiotropy and Co-dominance. Pleiotropy occurs when one gene influences multiple phenotypic traits. Co-dominance occurs when two different alleles are both fully expressed in the phenotype.
Step 2: Detailed Explanation:
1. Statement 1: This is the definition of Pleiotropy. For example, in Phenylketonuria, a single gene mutation leads to mental retardation, reduced hair, and skin pigmentation. This statement is correct.
2. Statement 2: The AB blood group is indeed an example of co-dominance, but the explanation is wrong. It is regulated by two dominant alleles ($I^A$ and $I^B$), not one dominant and one recessive. $I^O$ (or $i$) is the recessive allele in the ABO system. This statement is incorrect.
Step 3: Final Answer
Only Statement (1) is correct.
Was this answer helpful?
0
0
Top KCET Biology Questions
- Relate Column I with Column II with regard to predatory behaviour:
Column I Column II 1. Calotropis p. Invertebrates 2. Pisaster q. Distasteful 3. Monarch butterfly r. Cryptically colored 4. Frogs s. Cardioglycoside - Small mammals and birds are rarely found in polar regions. The reason is that
Match Column I and Column I
Column I Column II 1 Narrowly utilitarian argument p Conserving biodiversity for major ecosystem services 2 Broadly utilitarian argument q Every species has an intrinsic value and moral duty to pass our biological legacy in good order to future generation. 3 Ethical argument r Receiving benefits like food, medicine & industrial products. - Identify the correct statement/s about ex situ conservation. Advanced ex situ conservation includes i. Cryopreservation of gametes. ii. Plant tissue culture method. iii. Seed bank. iv. In vitro fertilisation.
- Identify the odd one out.
View More Questions
Top KCET Mendel’s Laws Of Inheritance Questions
- Test cross in pea plant is
- In a dihybrid cross between a true breeding round yellow seeded and true breeding wrinkled green seeded pea plant, the ratio of segregation of round and wrinkled seed traits in $F_2$ is
- The genotype of a husband and wife are $I^A I^B$ and $I^A I^O$. Among the blood types of their children, how many different genotypes and phenotypes are possible?
- Read the following statements.
Statement I : In a typical test cross, an organism showing a dominant phenotype is crossed with the recessive parent.
Statement II : The ratio of organisms showing dominant and recessive traits in F\(_{1}\) generation of a test cross indicates that the organism with unknown genotype is homozygous dominant.
Choose the correct option.
Top KCET Questions
- Which of the following is not true for oxidation?
- If $a, b$ and $c \in N$ which one of the following is not true ?
- When $50\, cm ^{3}$ of $0.2\, N$ $H_{2} SO _{4}$ is mixed with $50 cm ^{3}$ of $1 N\, KOH$, the heat liberated is :
- If $a | (b + c)$ and $a| (b-c)$ where $a,b,c \in \, N $ then
- Which of the following is NOT a pair of functional isomers?
View More Questions