Class 10 Science Biology Heredity and Evolution



Which of the following is considered as physical and chemical unit of heredity?
(a)
Gene
(b)
Chromosome
(c)
Nucleotide
(d)
Codon
(e)
Chromatid
Correct answer: (a) 
Solution: A gene is a locus (or region) of DNA which is made up of nucleotides and is the molecular unit of heredity. It controls the development and function of all organs and all working systems in the body. Genes are passed from parent to offspring; the combination of these genes affects all aspects of the human body, from eye and hair colour to how well the liver can process toxins. 
Therefore, the correct answer is option A.

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Similar topics
components of food
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components of food
heredity and evolution
how do organisms reproduce?
microorganisms: friend and foe
why do we fall ill?