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SingaporeBiology

Reproduction, Genetics and Inheritance

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How does genetic information sit on chromosomes, and how is it passed on when cells divide?

Describe chromosomes, genes and DNA and explain the role of cell division in growth and reproduction
A focused answer to the O-Level Biology outcome on chromosomes and cell division. The link between DNA, genes and chromosomes, and the roles of mitosis (growth) and meiosis (making gametes).
8 min answer →

How is a single characteristic, such as flower colour, passed from parents to offspring?

Use genetic diagrams to predict the inheritance of a single gene and explain variation
A focused answer to the O-Level Biology outcome on monohybrid inheritance. The key genetics terms, how to set out a genetic cross to predict offspring ratios, and the difference between continuous and discontinuous variation.
9 min answer →

How do humans reproduce, and how are the sex cells adapted to their roles?

Describe human sexual reproduction including fertilisation and the adaptations of the gametes
A focused answer to the O-Level Biology outcome on human reproduction. The male and female gametes and how they are adapted, the meaning of fertilisation, and why sexual reproduction produces variation.
8 min answer →

How do flowering plants reproduce by pollination and fertilisation?

Describe sexual reproduction in flowering plants including pollination and fertilisation
A focused answer to the O-Level Biology outcome on plant reproduction. The parts of a flower, the difference between insect and wind pollination, and the steps of pollination and fertilisation.
8 min answer →