Inheritance
19 review questions with answers for Inheritance. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
Different version of the same gene?
- Genotype
- Chromosome
- Phenotype
- AlleleRight answer
What this set covers
Alleles, genotype and phenotype are tested alongside dominant, recessive, homozygous, heterozygous and codominant inheritance, Punnett squares, sex chromosomes, Mendel's pea plants, cystic fibrosis, polydactyly, and continuous versus discontinuous variation.
- Common mix-up
- Students often mix up genotype and phenotype: the genotype is the combination of alleles, while the phenotype is the observable characteristic that results from them.
- Review tip
- Work through Aa × Aa and Aa × aa with a Punnett square each, state the ratios as both fractions and percentages, then explain what each result tells you.
All 19 questions and answers
Different version of the same gene?
Answer: Allele
Allele that is expressed when only one copy is present?
Answer: Dominant
Allele that is only expressed when two copies are present?
Answer: Recessive
Having two identical alleles of a gene?
Answer: Homozygous
Having two different alleles of a gene?
Answer: Heterozygous
The combination of alleles an organism has?
Answer: Genotype
The observable characteristics of an organism?
Answer: Phenotype
Diagram used to predict the genotypes of offspring from a cross?
Answer: Punnett square
Phenotype ratio of offspring from a cross between two heterozygotes (Aa × Aa)?
Answer: 3 : 1
Probability that a cross of Aa × aa produces an aa offspring?
Answer: 50%
Sex chromosomes of a human male?
Answer: XY
Probability that any one child is born a boy?
Answer: 1 in 2
Inheritance where both alleles in a heterozygote are fully expressed, as in blood group AB?
Answer: Codominance
Disorder caused by a recessive allele that produces thick, sticky mucus?
Answer: Cystic fibrosis
Disorder caused by a dominant allele that produces extra fingers or toes?
Answer: Polydactyly
Monk whose experiments on pea plants founded the study of inheritance?
Answer: Gregor Mendel
Fusion of a male and a female gamete?
Answer: Fertilisation
Type of variation with a range of values, such as height?
Answer: Continuous
Human blood group shows which type of variation?
Answer: Discontinuous
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.