IB Diploma Programme (DP) - SL & HL · Biology
5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on D3.2 Inheritance (Organisms).
In human blood groups, the alleles \(I^A\) and \(I^B\) are co-dominant, while the allele \(i\) is recessive. If a person with blood type AB has children with a person with blood type O, what are the possible blood types of their offspring?
Huntington's disease is an autosomal dominant disorder. If one parent is heterozygous for the Huntington's allele (Hh) and the other parent does not have the disease (hh), what is the probability that their first child will inherit the disorder?
A genetic disorder is observed in a family pedigree. The disorder affects males more frequently than females, and affected sons often have unaffected mothers but affected grandfathers (on the maternal side). Which mode of inheritance is most consistent with this pattern?
In a monohybrid cross between two individuals heterozygous for a dominant trait (Aa), what is the expected ratio of phenotypes in the offspring?
In a test cross, an organism with a dominant phenotype but an unknown genotype is crossed with an individual that is:
Which term is used to describe the specific location of a gene on a chromosome?
Write your answer out first, then check it against the worked solution.
Predict the phenotypic ratio of offspring produced from a cross between an individual with blood type \(I^A i\) and an individual with blood type \(I^B i\).
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A couple has two children: one with an autosomal recessive genetic disorder and one without. Assuming both parents are heterozygous carriers, explain how a Punnett square can be used to determine the probability of their next child inheriting the disorder and the probability of being a carrier.
Write your answer out first, then check it against the worked solution.
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