Question

Which phrase best describes a gene?
(1) a segment of a DNA molecule found only in
the body cells of an organism
(2) a segment of a DNA molecule found only in
the gametes of an organism
(3) a segment of a DNA molecule that contains
the instructions for producing a trait in an
organism
(4) a segment of a DNA molecule that contains
the instructions for producing all the
characteristics of an organism

Answer 1

the correct answer is D. The DNA contains all the information required for translating theminto all characteristics of an organsims. The DNA are packed with histone proteins, and are loacted on chromosomes. They are trasncribed and translated into the desired proteins, and thus, the traits

Answer 2

Answer: The correct answer is 3) A segment of a DNA molecule that contains  the instructions for producing a trait in an  organism.

Gene is a segment of DNA molecule that contains instructions ( in the form of nucleotide sequences), which are required for producing a specific trait ( characteristic) of an organism.

For this, gene is first transcribed into mRNA ( messenger RNA), which is then translated to produce a particular protein. The protein thus formed gives a specific characteristic to the organism.

Thus, option 3) is the best description for a gene.