Which of the following statements is true?

a.Mendel was the first scientist to visualise a gene as an inheritance in 19th century.

b.The term ‘Genetics’ was coined by William Bateson in 1906.

c.In human beings, there are 46 chromosomes. Of these, 44 (22 pairs) are autosomes and 2 (1 pairs) are sex chromosomes.

d. This is a correct sentence.

So , the answer would be option d)A DNA molecule is made up of two long polynucleotide strands forming a double helical structure (double helix) just like a spiral staircase.