DNA, Genes & Genetics MCQs with Answers

The alternate form of a gene that occurs at the same locus of a chromosome is called

• A.Allele
• B.Chromatid
• C.Centromere
• D.Genome

In the Maxam-Gilbert method, DNA threads are ?

• A.Chemically cut into pieces
• B.Enzymatically replicated
• C.Physically sheared by ultrasound
• D.Thermally denatured into single strands

Which nucleotide is found only in RNA?

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

If a person is tall, what is this physical expression called?

• A.Genotype
• B.Phenotype
• C.Karyotype
• D.Biotype

Autopolyploid individuals have ?

• A.A single set of chromosomes from single species
• B.More than two sets of chromosomes from different species
• C.Exactly two sets of chromosomes from single species
• D.More than two sets of chromosomes from single species

Chromosomal abnormality in Turner syndrome is represented by?

• A.XO
• B.XXY
• C.XXX
• D.XYY

If the codon consisted of only two nucleotides, there would be how many possible codons?

• A.8
• B.16
• C.32
• D.64

If a round seeded pea plant is self-fertilized and all of its offspring are also round seeded, then _.

• A.The parent plant is heterozygous for seed shape
• B.Both parents and offspring must be true breed
• C.Round seeds are a recessive trait
• D.The offspring will show a 3:1 ratio in the next generation

The physical appearance of traits is called:

• A.Genotype
• B.Phenotype
• C.Karyotype
• D.Biotype

Chromosomes in the cell which are similar to each other in shape and size are called?

• A.Homologous pair
• B.Heterozygous pair
• C.Alleles
• D.Sister chromatids