The recessive genes located on $X$-chromosome in humans are always
Expressed in males
Expressed in females
Lethal
Sub-lethal
A person having $45$ chromosomes where $Y$ chromosome is absent. Such a condition is known as
A human female with Turner’s syndrome
Trisomic condition of Down's syndrome arises due to
The genotype of a boy having sexual characters of a girl is
The person with klinefelter's syndrome