HARD
Upper Secondary: IGCSE
IMPORTANT
Earn 100

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.

Important Questions on Inheritance

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?

Question Image

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.
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. What is the chance that the couple's next child will be a colour-blind boy?
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>End-of-chapter questions>Q 3
Explain the difference between gene and allele.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Biology Coursebook Third Edition>Chapter 18 - Inheritance>End-of-chapter questions>Q 3
Explain the difference between dominant and recessive trait.