SSC General Science & Technology Sample Paper NCERT Sample Paper-1

  • question_answer
    Genes control heredity in man and other organisms. This gene is:

    A)  A protein molecule

    B)  A segment of RNA

    C)  A bead-like structure on the chromosomes

    D)  A segment of DNA

    Correct Answer: D

    Solution :

    [d] A gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases. The Human Genome Project has estimated that humans have between 20,000 and 25,000 genes.                    Every person has two copies of each gene, one inherited from each parent. Most genes are the same in all people, but a small number of genes (less than 1 percent of the total) are slightly different between people: Alleles are forms of the same gene with small differences in their sequence of DNA bases. These small differences contribute to each person's unique physical features.

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