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SingaporeCombined ScienceQuick questions
Biology: Genetics and Ecology
Quick questions on Cell division and inheritance: N(A)-Level Combined Science Biology
2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are alleles?Show answer
Most genes come in different versions called alleles. For example, the gene for height in pea plants has a tall allele and a short allele. An organism has two alleles for each gene, one from each parent. These two alleles may be the same or different.
What are genetic diagrams?Show answer
A genetic diagram (Punnett square) predicts the likely offspring of a cross. You write the alleles each parent can pass on (the gametes), then combine them in all possible ways. The diagram gives the expected ratio of offspring, not an exact count.
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