1. 1. If two parents are both heterozygous for the tongue rolling gene, predict what genotype and phenotype their offspring may have. Roller allele is dominant (R) Non-roller allele is recessive (r)

2. R R r r Male Female RR r Rr

3.  Offspring have a 25% change of being RR  50% chance of being Rr  25% chance of being rr  Offspring have a 75% chance of being able to roll their tongues  And a 25% chance they can not

4. 1) Explain what is meant by genotype and phenotype 2) Explain what is meant by dominant and recessive 3) Explain what is meant by homozygous and heterozygous 4) Use a Punnett Square

6. Handback Disease project Hand-in Captain O 2