Define gene, allele, genotype, phenotype and carrier status, interpret pedigrees, draw monohybrid diagrams, and calculate outcomes for dominant, recessive, codominant and X-linked traits.
Most Bengal tigers are orange with black stripes but there is a very small number of Bengal tigers that are white with black stripes.
The photograph shows a white Bengal tiger with black stripes.
White tiger offspring are produced by two Bengal tigers that each carry at least one recessive allele for a gene affecting coat colour.
The pedigree diagram shows the phenotypes in one family of tigers, bred in captivity.
Key female orange tiger female white tiger male orange tiger male white tiger
The phenotype is affected by the genotype.
State what is meant by the term genotype.
Determine the expected phenotypic ratio of orange tigers to white tigers born to the parents shown in this pedigree diagram.
Use a genetic diagram to support your answer.
Answer