Genetics Practice

Master genetics basics with our practice worksheet on alleles, genotype, and phenotype!

allele a letter that represents a trait genotype a letter combination that represents genes phenotype the physical trait that shows dominant one gene overpowers another recessive the weaker gene homozygous both dominant or both recessive heterozygous one is dominant, one is recessive If you have a dog with homozygous dominant brown hair (B), what would the genotype be? BB Bb bb A flower has a heterozygous gene for purple spots represented by the allele P, what would the genotype be? PP Pp pp What would the phenotype be for a cat with a genotype of gg where the G represents brown fur and the g represents blonde fur? brown fur blonde fur tabby fur Which is homozygous dominant? RR Rr rr Which is homozygous recessive? Rr RR rr Which is heterozygous? TT Tt tt