Test Preparation on Genetics – IV Biology Test Series for NEET - 2020

A colour blind man marries the daughter of a colour blind
person. Then in their progeny

1None of their daughters are colour blind
2All the sons are colour blind
3All the daughters are colour blind
4Half of their sons are colour blind

(d) Since daughter of a colourblind person will be a carrier
of the disease and only one of the two X chromosomes
will bear the recessive gene for disease, so half of their
sons will be colourblind.

This pedigree is of a rare trait, in which children have extra
fingers and toes. Which one of the following patterns of
inheritance is consistent with this pedigree

1Autosomal recessive
2Autosomal dominant
3Y-linkage
4Sex linked recessive

(c) Y-linked disorders are caused by mutations on the Ychromosome.
Bacause males inherit a Y-chromosome
from their fathers, every son of an affected father will be
affected. Because females inherit an X-chromosome
from their fathers, female offspring of affected fathers
are never affected.

If mother is a carrier for colour blindness and father is
normal, then in the offsprings this disease may be seen in

1All the sons
2All the daughters
350% sons and 50% daughters (carrier)
4All the sons and not in daughters

Study the pedigree chart given below

What does its show

1Inheritance of a sex-linked inborn error of metabolism like phenylketonuria
2Inheritance of a condition like phenylketonuria as an autosomal recessive trait
3The pedigree chart is wrong as this is not possible
4Inheritance of a recessive sex-linked disease like haemophilia

Select the incorrect statement from the following

1Linkage is an exception to the principle of independent assortment in heredity
2Galactosemia is an inborn error of metabolism
3Small population size results in random genetic drift in a population
4Baldness is a sex-limited trait

A normal-visioned man whose father was colour-blind,
marries a woman whose father was also colour-blind. They
have their first child as a daughter. What are the chances
that this child would be colour-blind

150%
2100%
30%
425%

Person whose father is colourblind marries a lady whose
mother is daughter of a colourblind man. Their children will
be

1All normal
2All colour blind
3All sons colour blind
4Some sons normal and some colour blind

(d) A person whose father is colourblind i.e. person is
normal because colour blind genes located on Xchromosome
of father and it is transferred into only its
daughters. This person marry with a lady whose mother
is daughter of colour blind father i.e. lady is carrier for
colour blind. Thus normal man marries with a carrier
lady and their sons will be some normal and some
colour blind.

Pick out the correct statements
(A) Haemophilia is a sex-linked recessive disease
(B) Down’s syndrome is due to aneuploidy
(C) Phenylketonuria is an autosomal recessive gene
disorder
(D) Sickle cell anaemia is a X-linked recessive gene disorder

1(A) and (D) are correct
2(B) and (D) are correct
3(A), (C) and (D) are correct
4(A), (B) and (C) are correct


Right Ans	Wrong Ans	Not Attempted

Test Preparation on Genetics – IV Biology Test Series for NEET - 2020

A colour blind man marries the daughter of a colour blindperson. Then in their progeny

This pedigree is of a rare trait, in which children have extrafingers and toes. Which one of the following patterns ofinheritance is consistent with this pedigree

If mother is a carrier for colour blindness and father isnormal, then in the offsprings this disease may be seen in

Study the pedigree chart given below What does its show

Select the incorrect statement from the following

A normal-visioned man whose father was colour-blind,marries a woman whose father was also colour-blind. Theyhave their first child as a daughter. What are the chancesthat this child would be colour-blind

Person whose father is colourblind marries a lady whosemother is daughter of a colourblind man. Their children willbe

Pick out the correct statements(A) Haemophilia is a sex-linked recessive disease(B) Down’s syndrome is due to aneuploidy(C) Phenylketonuria is an autosomal recessive genedisorder(D) Sickle cell anaemia is a X-linked recessive gene disorder