In mammals, Y-linkage refers to when a phenotypic trait is determined by an allele (or gene) on the
a) X-chromosome
b) Y-chromosome
c) autosomes
d) all of these The
hemophilia allele is recessive and carried on the………..
a) autosomes
b) X-chromosomes
c) Y-chromosome
d) none of these
Hemophilia is predominantly a………. disorder.
a) male
b) female
c) child
d) all of these
Explanation: male has one X-chromosome having no counterpart allele on Y
Which of the following largely the phenotypically maintain the faulty allele for hemophilia in human population?
a) normal males
b) affected males
c) carrier females
d) all of these
Explanation: hemophilic males less likely to survive, marry and reproduce
Which of the following colour blindness is a recessive sex linked trait?
a) red green
b) red blue
c) green blue
d) all of these
Explanation: individuals unable to distinguish shades of red or green and both appear gray
A son inherits the colour-blind allele from his…….
a) father
b) mother
c) grandfather
d) all of these
Explanation: the gene for colour blindness present on X and the son receives X from mother
