Which of the following linked traits are commonly referred as sex-linked trait?
a) X-linked traits
b) Y-linked traits
c) autosomal traits
d) both a and b
X-linked trait passes in a crisscross fashion from……….(P1) through his/her…….(F1) to the………(F2).
a) paternal grandfather à son à grandson
b) paternal grandfather à son à granddaughter
c) paternal grandfather à daughter à grandson
d) maternal grandfather à daughterà grandson
Explanation: it never passes from directly from father to son because son inherits X chromosome from mother
Which of the following is/are X-linked trait/s?
a) haemophilia
b) colour blindness
c) hypophosophatemia
d) all of these
Explanation: hypophosophatemia is also called vitamin D resistant rickets
Which of the following X-linked trait/s is/are recessive trait/s?
a) haemophilia
b) colour blindness
c) hypophosophatemia
d) both a and b
Explanation: alleles for these two traits must be present on both X-chromosomes in female while in male single allele on X can produce the phenotypes
Which of the following X-linked trait/s is/are dominant trait/s?
a) haemophilia
b) colour blindness
c) hypophosophatemia
d) both a and b
Explanation: single X carrying dominant allele (heterozygous female) can produce its phenotype
Which of the following possessing one X-linked recessive mutation are considered carriers and will generally not manifest clinical symptoms of the disorder?
a) females
b) males
c) both a and b
d) none of them
Explanation: because female has two X-chromosomes
