EASY
Upper Secondary: IGCSE
IMPORTANT
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If a normal human cell has 46 chromosomes, how many chromosomes are there in a human sperm cell?

Important Questions on Inheritance

MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>Questions>Q 18.9
Using the symbols N for normal wings, and n for vestigial wing, write down the genotype of a fly which is heterozygous for this characteristic.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>Questions>Q 18.9
Using the symbols N for normal wings, and n for the vestigial wing, write down the possible genotypes of the gametes of a heterozygous fly.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>Questions>Q 18.10
The normal wing of a fly is represented by the symbol N and n for the vestigial wing. Using a complete genetic diagram, work out what kind of offspring would be produced if the heterozygous fly mated with one which was homozygous of normal wings.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>Questions>Q 18.11
In humans, the allele for red hair, b is recessive to the allele for brown hair, B. A man and his wife both have brown hair. They have five children, three of whom have red hair, while two have brown hair. Explain how this may happen, using a genetic diagram to explain the answer.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>Questions>Q 18.12
In Dalmatian dogs, the allele for black spots is dominant to the allele for liver spots. If a breeder has a black-spotted dog, how can he or she find out whether it is homozygous or heterozygous for this characteristic? Use genetic diagrams to explain the answer.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>Questions>Q 18.13
A man of blood type A married a woman of blood type B. They had three children, of blood types, O, B and AB, respectively. What are the genotypes of the parents and children? Use the genetic diagram to explain the answer.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>Questions>Q 18.14

The pedigree diagram shows the known blood group in three generations of a family. Squares represent male and circle represent the females. What are the genotypes of 1 and 3? What is the blood group of 2?

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HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>Questions>Q 18.15
A man who is red-green colour-blind marries a woman with normal vision. They have three sons and two daughters. One of the sons is red-green colour-blind. All the other children have normal colour vision. Draw a genetic diagram to suggest an explanation for this.