Which of the following statements is true?

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RRB ALP Previous Paper 20 (Held On: 30 Aug 2018 Shift 2)

The term 'Genetics’ was coined by J. D. Watson in 1906.
In human beings, there are 46 chromosomes. Of these, 42 (21 pairs) are autosomes and 4 (2 pairs) are sex chromosomes.
Mendel was the first scientist to visualise a gene as an inheritance in 1886.
A DNA molecule is made up of two long polynucleotide strands forming a double helical structure (double helix) just like a spiral staircase.

Answer 1

The term ‘Genetics’ was coined by William Bateson in the year 1905.
In human beings, in each cell, there are 46 (23 pairs) chromosomes.
Twenty-two of these pairs are autosomes and 23^rd pair, the sex chromosome differs in male and females.
Females have 2 copies of the X chromosome while males have one X and one Y chromosome.
Mendel was the first scientist to visualise a gene as an inheritance in 1885.
A Deoxyribonucleic acid (DNA) is a long polymer of deoxyribonucleotides.
A DNA molecule is made up of two long polynucleotide strands forming a double helical structure (double helix) just like a spiral staircase.