Heredity and common genetic diseases
Exercise
1. Answer the following questions in one sentence.
• 1) Name one X linked genetic disease.
• 2)Name one Y linked genetic disease.
• 3)Name one autosomal recessive disorder in man.
• 4)Which are the types of genetic variations found in man?
• 5)Name two characters found in pea plant that was used by Mendel to find out the
monohybrid cross?
• 6)Which colour of hair coat in the Guineapig was found to be dominant trait in the cross
performed by Mendel?
• 7)In the F1 generation of the monohybrid cross which trait appears as the phenotype
character?
• 8)Name the law deduced from the dihybrid cross of the pea plant.
• 9)Monohybrid cross has one exception in the law deduced from it,name the law which tells
about the exception.
• 10) How many characters are required to prove the dihybrid cross?
Answers
1) Name one X linked genetic disease.
Haemophilia
• 2)Name one Y linked genetic disease.
deficiency of alpha 1 antitrypsin
• 3)Name one autosomal recessive disorder in man.
sickel cell anaemia
• 4)Which are the types of genetic variations found in man?
mutations ,Gene flow
• 5)Name two characters found in pea plant that was used by Mendel to find out the
monohybrid cross?
cross between tall and dwarf plant, green pod and yellow pod
• 6)Which colour of hair coat in the Guineapig was found to be dominant trait in the cross
performed by Mendel?
dominant- black coat color
recessive - white coat color
• 7)In the F1 generation of the monohybrid cross which trait appears as the phenotype
character?
dominant trait
8)Name the law deduced from the dihybrid cross of the pea plant.
Law of segregation
• 9)Monohybrid cross has one exception in the law deduced from it,name the law which tells
about the exception.
• 10) How many characters are required to prove the dihybrid cross?
two characters
eg seed color and seed shape