Inheritance questions reward you for stating only what the evidence supports. This hub gathers four lessons and a practice set on doing that.
It extends the main cluster on inheritance. If crosses themselves feel shaky, read completing monohybrid crosses first.
What does this set cover?
Each lesson teaches one habit of careful reasoning.
- Reading a fictional pedigree: drawing conclusions from a diagram without inferring a real person’s status.
- Probability for one offspring versus an expected family count: why 1 in 4 does not mean exactly one in every four.
- Two genotypes, one phenotype: why appearance cannot fix a genotype.
- Missing information before assigning a genotype: naming what you still need.
How do the skills connect?
The pedigree lesson shows how evidence builds a conclusion. The probability lesson explains what a ratio does and does not promise. The last two lessons show why some questions cannot be answered from appearance alone.
Together they train you to read crosses and family diagrams carefully.
One example: a tall plant
An invented plant is tall. Its genotype could be TT or Tt, because both show the tall phenotype.
Nothing in the question says which, so a careful answer writes “TT or Tt”. If a cross with a short plant gave half short offspring, the evidence would settle it as Tt. Wait for that kind of evidence before you commit.
Where should you start?
If you fill in genotypes on a pedigree from a quick look, start with the pedigree lesson. If you read “3:1” as a promise, begin with the probability lesson. If you write “TT” for every tall plant, start with two genotypes, one phenotype.
Afterwards, try the practice set and use the claim, evidence and explanation revision desk on your answers. For teacher support, see online one-to-one Biology tuition.