[4 Mark Questions]

Question 14 Marks

What is the difference between a gene mutation and a chromosomal mutation?

Answer

Gene mutation	Chromosomal mutation
1. A change in the nucleotide sequence, in a particular gene.	1. A change in several genes in the chromosome.
2. Gene mutation is only a structural alteration.	2. The chromosomal mutation is either numerical or structural changes in the entire DNA strand.

View full question & answer→

Question 24 Marks

What do you understand about DNA, gene and chromosome in short?

Answer

Deoxy ribonucleic acid [DNA] is the material located in the cells and nucleus, that makes up the chromosomes and genes. Its molecule is in the shape of a double helix.

A gene is a segment of DNA that is passed down from parents to children and confers a trait to the offspring. Genes are organised and packaged in units called chromosomes.

Chromosomes are thin, long thread-like structures contain two identical strands, called chromatids, held together by a centromere. Humans have 23 pairs of chromosomes.

View full question & answer→

Science [4 Mark Questions]

Test yourself on this topic