DNA, Genes & Genetics MCQs with Answers

According to Erwin Chargaff (1951), the ratio of A and T is?

• A.Adenine is half of Thymine
• B.Adenine is double of Thymine
• C.Adenine equals to Thymine
• D.Adenine equals to Guanine

In a dihybrid cross, which Law of Mendelian genetics is illustrated when two pairs of contrasting traits are crossed and segregated independently?

• A.Law of Segregation
• B.Law of Independent Assortment
• C.Law of Dominance
• D.Law of Incomplete Dominance

The outer part of DNA helix made up of sugar and phosphate is called ?

• A.Backbone
• B.Rung
• C.Upright
• D.Base pair

Chromosomes reduce to half in Meiosis cell division at ?

• A.Metaphase I
• B.Anaphase II
• C.Prophase I
• D.Anaphase I

The human cell contains _ chromosomes?

• A.23
• B.44
• C.48
• D.46

Which of the following are used to select genes of interest from a genomic library?

• A.Primers
• B.Vectors
• C.Probes
• D.Restriction enzymes

J. Seiler in 1914 discovered which type of sex determination in moths?

• A.XX-XY
• B.ZZ-ZW
• C.XO-XX
• D.Haplodiploidy

The pattern of sex determination found in Drosophila is?

• A.XX–XO
• B.XY–XX
• C.ZZ–ZW
• D.Haplodiploidy

How many sex chromosomes are present in a human being?

• A.1 pair
• B.46 pairs
• C.23 pairs
• D.2 pairs

Crossing over is a form of?

• A.Mutation
• B.Transcription
• C.Recombination
• D.Translation