Genetics & Punnett SquaresATI TEAS 7 cheat sheet

Predicting the offspring

9 key facts 3 practice questions Reviewed Oct 2026

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Vocabulary

Genotype = the alleles (BB, Bb, bb); phenotype = what you see
Homozygous = two of the same; heterozygous = one of each
Dominant masks recessive; recessive shows only as bb

The Square

Put one parent's alleles across the top, the other's down the side
Fill each box with one allele from each parent

Classic Ratios

Bb × Bb → 3:1 phenotype, 1:2:1 genotype
Bb × bb → 1:1
BB × bb → all Bb

Sex-Linked

Carried on the X chromosome — males (XY) show recessive traits more often

Key takeaway

Predicting the offspring

Before you read

Test yourself first: 3 questions

Question 1 of 3

A Punnett square is a tool used to predict the:

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