Monohybrid Practice

Ace monohybrid genetics! Practice Punnett squares & master key terms like dominant, recessive, genotype, and phenotype.

Before you use Punnett squares, review the main concepts. Turn to your notes when you can't match.I. Match the words to their definitions Homozygous having identical (same) alleles for a gene Heterozygous having different alleles for a gene Dominant The trait that will appear in a heterozygous individual (Tt) Recessive The trait that does NOT appear in a heterozygous individual (Tt) Phenotype observable traits of an organism - how it looks Genotype genetic makeup of an organism; an organism's combination of alleles II. Watch the video. Then fill in the Punnett squares and answer the questions. 1. In rabbits, black fur is dominant to white fur. If you cross a BB male with a Bb female. Fill in the Punnett square to predict the outcome of offspring. Then use this Punnett square to answer the multiple choice questions. B B B b BB BB Bb Bb 2. The phenotypic ratio is... 2:2 3:1 1:2:1 100% black 3. The genotypic ratio is... 100% black 1:3 2:2 1:2:1 3. What percentage will be homozygous dominant? 25% 50% 75% 0% 4. What percentage will be heterozygous? 25% 50% 75% 0% 5. What percentage will be homozygous recessive? 25% 50% 75% 0%