ICSE Class 10 Biology: Genetics

Question 1

The physical appearance of an organism determined by its genes is called its:

Accepted Answer

Phenotype

Question 2

In a monohybrid cross between two heterozygous parents (Aa × Aa), the phenotypic ratio is:

Accepted Answer

3:1

Question 3

DNA is made up of nucleotides. Each nucleotide contains:

Accepted Answer

A sugar, a phosphate group, and a nitrogenous base

Question 4

Sex determination in humans: a female has sex chromosomes:

Accepted Answer

XX