Human skin color is a classic example of: MCQ with Answer and Explanation

Question
Human skin color is a classic example of:
A. Polygenic inheritance
B. Linkage
C. Pleiotropy
D. Mendelian inheritance
Answer: Option A
Solution (By JKSSB Mock Tests)
Polygenic inheritance occurs when a single phenotypic trait is controlled by two or more different genes at different loci, each having an additive effect. Human skin color, height, and eye color are controlled by multiple genes (e.g., at least three genes for skin color). This results in a continuous range of phenotypes, forming a bell-shaped curve in a population.
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Question #1
The disease characterized by the inflammation of the liver caused by a virus is:
A. Hepatitis
B. Cirrhosis
C. Pancreatitis
D. Nephritis
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Correct Answer: Option A

Explanation:
Hepatitis (A, B, C, etc.) is liver inflammation, often viral. Symptoms include jaundice, fatigue, and liver enzyme elevation. Cirrhosis is liver scarring, pancreatitis is pancreatic inflammation, nephritis is kidney inflammation. Hepatitis B and C can become chronic and lead to liver cancer.
This question belongs to: Science Biology
Question #2
Consider statements about scientists: 1. Robert Hooke coined the term 'cell'. 2. Antonie van Leeuwenhoek discovered the cell nucleus. 3. Matthias Schleiden proposed that all plants are made of cells. Which are correct?
A. 1, 2 and 3
B. 2 and 3 only
C. 1 and 3 only
D. 1 and 2 only
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Correct Answer: Option C

Explanation:
Robert Hooke observed cork tissue in 1665 and coined the term 'cell' to describe the box-like structures. Matthias Schleiden, a botanist, concluded in 1838 that all plants are composed of cells, forming a core tenet of the cell theory. The cell nucleus was discovered by Robert Brown in 1831, not Antonie van Leeuwenhoek, who is famous for discovering living microorganisms. Thus, statements 1 and 3 are correct.
This question belongs to: Science Biology
Question #3
The technique of growing plants under controlled conditions in a sterile medium is:
A. Cloning
B. Genetic engineering
C. Hydroponics
D. Tissue culture
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Correct Answer: Option D

Explanation:
Tissue culture involves growing plant cells, tissues, or organs on a nutrient medium under aseptic conditions to produce clones or disease-free plants.
This question belongs to: Science Biology
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