Biology Paper 2
Genetic crosses
Inheritance, Variation and Evolution training before the targeted original question drill.
Adaptive teaching card
Make it concrete
Analogy
Genetic crosses is like a living system solving a small survival problem: each part has a job, and the answer depends on how those jobs connect.
Why now: An analogy helps when the definition feels abstract.
Do this: Match each part of the analogy to the science idea.
Learn it
Alleles are different versions of the same gene.
A dominant allele is expressed with one copy; a recessive allele needs two copies.
Punnett squares predict possible offspring genotypes.