AP Biology Exam Sample Test

Try 5 free practice questions with instant feedback. See how ready you are.

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Sample Questions

Question 1

What is Mendel's Law of Segregation?

Answer: Each organism carries two alleles for each trait, and these alleles separate during gamete formation so that each gamete carries only one allele.

Question 2

What is Mendel's Law of Independent Assortment, and what cellular process is it based on?

Answer: Alleles of different genes assort independently of each other during gamete formation. It is based on the random alignment of homologous chromosome pairs during metaphase I of meiosis.

Question 3

In a monohybrid cross between two heterozygous parents (Aa × Aa), what are the expected genotypic and phenotypic ratios?

Answer: The genotypic ratio is 1 AA : 2 Aa : 1 aa, and the phenotypic ratio is 3 dominant : 1 recessive.

Question 4

What is the difference between a monohybrid and a dihybrid cross?

Answer: A monohybrid cross examines the inheritance of one trait, while a dihybrid cross examines the simultaneous inheritance of two independently assorting traits.

Question 5

What is the expected phenotypic ratio for a dihybrid cross between two heterozygous parents (AaBb × AaBb)?

Answer: The expected phenotypic ratio is 9:3:3:1, representing four phenotypic classes when two genes assort independently.