Which of the following is an example of sex-linked disease?
$AIDS$
Colour blindness
Syphilis
Gonorrhoea
Colour blindness and haemophilia are well known examples of sex-linked diseases.
Given below is a highly simplified representation of the human sex chromosomes from a karyotype.
The genes $a$ and $b$ could be of
Choose correct option.
$(i)$ The heterozygous female transmit the disease to son.
$(ii)$ Change in the shape of the $RBC$ from biconcave disc to elongated sickle like structure.
$(iii)$ Mentally retarded.
$(iv)$ Heamoglobin not formed proper amount in blood.
One of the genes present exclusively on the $X$-chromosome in humans is concerned with
Which one of the following symbols represents mating between relatives in human pedigree analysis?
Which one of the following symbols and its representation, used in human pedigree analysis is correct ?
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