QUESTION 1 / 20 · MENDELIAN INHERITANCEEasy
An organism with two different alleles for a gene (like Aa) is…
PUNNETT SQUARE BUILDER
Cross two parents, predict the offspring
Each parent passes on one copy of each gene, chosen at random. The grid shows every equally likely combination. Pick a kind of inheritance and the parents' genotypes.
Yy
Y
YYYellowYyYellow
yYyYellowyyGreen
OFFSPRING PHENOTYPES3 : 1
Mendel's classic cross: 3 yellow to 1 green, because yellow (Y) is dominant. A quarter of the offspring are yy and show the hidden recessive trait.Yellow3/4 · 75%
Green1/4 · 25%
What this genetics test covers, in short
Twenty multiple-choice questions at upper-secondary to first-year university level, four on each of five topics: Mendelian inheritance, chromosomes and meiosis, sex linkage and pedigrees, human genetics, and population genetics.
For DNA, codons and mutation at the molecular level, see the molecular biology test. This test is our own and not normed.
By What's Your IQ · Reviewed 5 Oct 2026- Format
- 20 multiple-choice questions
- Level
- A-level / AP to first-year
- Bonus
- Punnett square builder, 4 inheritance types
- Founding paper
- Mendel, Experiments on Plant Hybridization (1866)