- The letters on the inside of the Punnett square stand for the possible genotypes of the offspring.
- For problem 15:
- First square (n x NN): All four boxes are Nn. Shade all green.
- Second square (N x Nn): Top row is NN, Nn; bottom row is NN, Nn. Shade NN red, Nn green.
- Third square (N x n): Top row is Nn, nn; bottom row is Nn, nn. Shade Nn green, leave nn unshaded.
- Fourth square (n x Nn): Top row is Nn, nn; bottom row is Nn, nn. Shade Nn green, leave nn unshaded.
- For problem 16a (Ss x ss):
- Punnett square: Ss, Ss, ss, ss.
- Expected number of offspring: 2 Short hair (SS or Ss), 2 Long hair (ss).
- For problem 16b (Ss x Ss):
- Punnett square: SS, Ss, Ss, ss.
- Expected number of offspring: 3 Short hair, 1 Long hair.
- For problem 17:
- P₁: HH (hornless bull) x hh (horned cow)
- F₁: All offspring are Hh (genotype), hornless (phenotype).
Parent Tip: Review the logic above to help your child master the concept of monohybrid crosses worksheet answers.
