Page 69 - Biology - XII

Q3. Study the following.
d
D d
X Y X X

D
D d
d
d
D d
X Y X X X X X Y X Y X Y ........ X Y
d
d d
Which type of trait is represented by this pedigree (incomplete shown)?
(a) X-linked (b) X-linked dominant (c) Y-linked (d) Y-linked dominant
Q4. Bifi d tongue in human is a rare sex-linked defect. It is also marked with the absence of teeth.
It is a
(a) Y-chromosome dominant, a common defect (b) Y-chromosome recessive, a rare defect
(c) X-chromosome dominant, a common defect (d) X-chromosome dominant, a rare defect

Q5. Colour blindness is a defect that a person may be aff ected. It is
(a) X-linked recessive trait (b) X-linked dominant trait
(c) Y-linked recessive trait (d) Y-linked dominant trait

Q6. Albinism is
(a) autosome linked (b) autosome recessive trait
(c) autosome dominant trait (d) (a), (b), and (c)

Q7. Oral facial digital syndrome is a sex-linked defect. The encoding gene for same is
(a) Y-chromosome dominant (b) Y-chromosome recessive
(c) X-chromosome dominant (d) X-chromosome recessive

Q8. Male individual in a pedigree chart is represented by
(a) square (b) circle (c) M (d) F

Q9. A sex-linked recessive trait. Males express it even if they are hemizygous and females express
only when they are homozygous. Such as haemophilia.
(a) Aff ected persons are related to one another through the maternal side of their family (cousins).
(b) Aff ected persons are not related to one another.
(c) Aff ected persons are of same family. (d) None of these.

Q10. In case a defect is expressed only in males, then it is
(a) X-linked (b) Y-linked (c) autosomal (d) all of these

Q11. The symbol used in a pedigree chart drawing represents
(a) siblings (b) off springs
(c) brother and sister
(d) marriage between normal individuals—male and female

Q12. Swati wants to represent a carrier female for a disease in the pedigree chart drawing, the
suitable symbol is
(a) (b) / (c) (d) /

Q13. Shaded symbol or in a pedigree chart drawing means
(a) normal individual (b) carrier individual (c) off spring (d) diseased individual

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