HARD
AS and A Level
IMPORTANT
Earn 100

A cell with three sets of chromosomes is said to be triploid, 3n. A cell with four sets of chromosomes is said to be tetraploid, 4n. Could meiosis take place in a 3n or a 4n cell? Explain.

Important Questions on Inheritance

HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 16 - Inheritance>Questions>Q 6

A diploid (2n) chromosome number of Drosophila is 8. Copy and complete the table given below to show the different outcomes of the mitotic and meiotic division of a Drosophila cell.

  Mitosis Meiosis
number of division cycles    
number of daughter cells    
number of chromosomes 
per nucleus in daughter cells		    

 

HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 16 - Inheritance>Questions>Q 7
Construct a genetic diagram to predict the chance that a child born to two parents, both with blood group AB, will have blood group B. Use the symbols IA and IB to represent the alleles.
HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 16 - Inheritance>Questions>Q 8
A woman with blood group A and a man with blood group B have a child with blood group O. Use this information to determine the genotypes of the woman and the man, and then construct a genetic diagram to explain how the child inherited her blood group. Use the symbols IA, IB and IO.
HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 16 - Inheritance>Questions>Q 9
Construct a genetic diagram to show that all of the offspring of a cross between a homozygous brown rabbit and a white rabbit are heterozygous brown rabbit.
HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 16 - Inheritance>Questions>Q 10
Construct a genetic diagram to predict the ratio of phenotypes in the F2 generation of a cross between a homozygous brown rabbit and a white rabbit.
HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 16 - Inheritance>Question>Q 11
A test cross was carried out between a brown rabbit and a white rabbit. Five brown offspring and one white offspring were produced. Use a genetic diagram to show how this indicates that the brown rabbit must be heterozygous.
HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 16 - Inheritance>Question>Q 11
A test cross using a different brown rabbit produced four offspring, all of which were brown. Explain why this indicates that the brown rabbit may be homozygous.
HARD
AS and A Level
IMPORTANT
Biology for Cambridge International AS & A Level coursebook 2nd Edition Digital Access>Chapter 16 - Inheritance>Questions>Q 12
Explain why a boy cannot inherit haemophilia from his father.