BIOLOGY 5090 · STRUCTURED PRACTICE
In guinea pigs, black coat colour is determined by a dominant allele (B) and brown coat colour is determined by a recessive allele (b).
Distinguish clearly between the terms genotype and phenotype.
A male black guinea pig of unknown genotype is mated with a female brown guinea pig. Over several litters, they produce 14 black offspring and 15 brown offspring.
State the genotype of the female brown parent.
Deduce the genotype of the male black parent, giving a scientific reason based on the offspring produced.
In human ABO blood groups, alleles and are codominant, while allele is recessive. A man with Blood Group A and a woman with Blood Group B have a child with Blood Group O. State the genotypes of both parents and deduce the probability of their next child having Blood Group AB.
Total: 7 marks