DNA, Genes & Genetics MCQs with Answers

DNA is a very large molecule and consists of units called?

• A.Amino acids
• B.Nucleotides
• C.Fatty acids
• D.Monosaccharides

Diameter of DNA double helix is _?

• A.200 nm
• B.20 nm
• C.0.2 nm
• D.2 nm

Phenomenon in which a pair of homologous chromosomes fails to separate during cell division is called?

• A.Replication
• B.Crossing over
• C.Translocation
• D.Non-disjunction

If you mate a homozygous dominant individual with a homozygous recessive individual, what will be the genotype of the F1 generation?

• A.All heterozygous
• B.Half homozygous dominant, half homozygous recessive
• C.All homozygous dominant
• D.All homozygous recessive

Type of mutation which results in formation of premature stop codon in a coding region of genome is termed as ?

• A.Nonsense mutation
• B.Missense mutation
• C.Silent mutation
• D.Frameshift mutation

Which generation shows characteristics completely without change?

• A.F1 generation
• B.F2 generation
• C.P generation
• D.Hybrid generation

Humans have 99% identical genome with ?

• A.Gorillas
• B.Chimpanzees
• C.Orangutans
• D.Bonobos

In DNA, the number of adenine molecules is always equal to the number of?

• A.Guanine
• B.Cytosine
• C.Thymine
• D.Uracil

In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.1. What is the percentage of the population that is heterozygous for this allele?

• A.9%
• B.81%
• C.18%
• D.1%

Cloning is the production of multiple identical offspring. From which type of cell was Dolly cloned?

• A.Skin cell
• B.Nerve cell
• C.Liver cell
• D.Udder cell