Which of the following statements is true?
|A) Mendel was the first scientist to visualise a gene as an inheritance in 1886||B) The term ‘Genetics’ was coined by J.D. Watson in 1906|
|C) In human beings, there are 46 chromosomes. Of these, 42(21 pairs) are autosomes and 4(2 pairs) are sex chromosomes||D) A DNA molecule is made up of two long polynucleotide strands forming a double helical structure (double helix) just like a spiral staircase|
The statement that is true is:
“D) A DNA molecule is made up of two long polynucleotide strands forming a double helical structure (double helix) just like a spiral staircase.”
The structure of DNA was discovered by James Watson and Francis Crick in 1953. They found that a DNA molecule consists of two long polynucleotide strands that are twisted around each other to form a double helix. The double helix resembles a spiral staircase, with the sugar and phosphate molecules forming the sides of the staircase and the nitrogenous bases forming the steps. This discovery revolutionized the field of genetics and provided the foundation for understanding how DNA carries genetic information.
Mendel is considered the father of modern genetics, and he proposed the laws of inheritance in the 1860s. The term “genetics” was coined by William Bateson in 1905. In human beings, there are 46 chromosomes, including 22 pairs of autosomes and 1 pair of sex chromosomes (XX or XY).