Practice D3.2 Inheritance with authentic IB Biology exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like cell biology, genetics, and ecology. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Paper
Level
Question 1
HLPaper 1A
The Punnett square shown represents a cross between a red-flowered plant (RR) and a white-flowered plant (rr), producing all heterozygous offspring (Rr) with pink flowers.
If one of these pink-flowered (Rr) offspring is self-pollinated, what would be the expected phenotypes of the second-generation (F2) offspring and in what proportion?
Question 2
SLPaper 1A
Which inheritance pattern best describes a trait that is only expressed in males, despite females carrying the allele?
Question 3
SLPaper 1A
In Mirabilis jalapa, red flowers (RR) crossed with white (WW) produce pink (RW) offspring. Which best explains why not all RW plants are the same shade of pink?
Question 4
SLPaper 1A
In a pedigree, two phenotypically normal parents have an affected child for a rare disorder. What conclusion is most likely?
Question 5
SLPaper 1A
Which of the following individuals would have the greatest number of expressed traits from heterozygous genotypes?
Question 6
SLPaper 1A
Which of the following statements is accurate about an individual with genotype IAi?
Question 7
SLPaper 1A
Why can a male never be a carrier for an X-linked recessive condition?
Question 8
SLPaper 1A
What is the purpose of meiosis in eukaryotic organisms?
Question 9
SLPaper 1A
A lizard changes color based on temperature but does not pass this change to offspring. What does this represent?
Question 10
SLPaper 1A
In a pedigree chart, which pattern suggests a recessive autosomal disorder?