Back to the full dot-point answer
SingaporeBiologyQuick questions
Reproduction and Inheritance
Quick questions on Inheritance and genetic crosses: N(A)-Level Biology Reproduction and Inheritance
4short 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 is working out a cross with a Punnett square?Show answer
A Punnett square is a simple grid that shows the possible offspring from two parents. You put the sex cells (each carrying one allele) along the top and the side, then fill in the combinations. The grid then shows the genotypes of the offspring and lets you read off the ratio.
What is q1?Show answer
State what an allele is. [1 mark]
What is q2?Show answer
A plant is Tt, with T (tall) dominant over t (short). State its phenotype and give a reason. [2 marks]
What is q3?Show answer
Two Tt plants are crossed. State the ratio of tall to short offspring expected. [2 marks]
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.