Practice MCQ Questions and answers on Biology-GK

Within the DNA molecule, guanine bases located on one strand form chemical bonds with cytosine bases on the opposite strand.

Guanine - cytosine describes the correct pairing of DNA bases.

The sex of the child depends on the male chromosome which is transferred to the offspring. This happens because males have a mismatched pair of chromosome XY which is responsible for deciding the sex of the child.

Mendel's law of dominance states that in a heterozygote, one trait will conceal the presence of another trait for the same characteristic. Rather than both alleles contributing to a phenotype, the dominant allele will be expressed exclusively.

The only other difference in the nucleotides of DNA and RNA is that one of the four organic bases differs between the two polymers. The bases adenine, guanine, and cytosine are found in both DNA and RNA; thymine is found only in DNA, and uracil is found only in RNA.

The five-carbon sugar ring and the content of the nitrogenous base between DNA and RNA are slightly different from each other. Four different types of nitrogenous bases are found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). In RNA, the thymine is replaced by uracil (U).

Genetics is the study of how heritable traits are transmitted from parents to offspring. Humans have long observed that traits tend to be similar in families.

The inherited traits of an organism are controlled by DNA molecules.

Homologous chromosomes are identical to each other on the basis of their morphology, position of centromere and other characteristics.

X from father and X from mother is the correct pair of inherited chromosomes for the child to be a girl.