Biology - Genetics - Basic - Punnett squares - Punnett Square Practice Problems

5 progressively harder problems. Problem 1: 'BB × bb → Fill in the 4 squares.' (All Bb). Ask: 'What % are heterozygous?' (100%). Problem 2: 'Bb × Bb → Fill in squares.' (BB, Bb, Bb, bb). Ask: 'Phenotype ratio?' (3:1). Problem 3: 'In peas, yellow (Y) is dominant over green (y). Cross Yy × Yy. What fr