In the above pedigree, assume that no outsider marrying in, carry a disease. Write the genotypes of $C$ and $D$.
$XcY$ and $Xc Xc$
$X X c$ and $X Y$
$XY$ and $Xc Xc$
$X c X c$ and $XcX$
A husband and wife have normal vision but fathers of both of them were colour blind. Probability of their first daughter to be colour blind is
A colour blind son will born when
:Match the columns :
Column $I$ |
Column $II$ |
$(a)$ Sickle cell anaemia | $(x)$ Homogentisic acid |
$(b)$ Alkaptonuria | $(y)$ Melanin pigmentsare absent |
$(c)$ Albinism | $(z)$ More amount of phenyl alanine |
$(d)$ Phenyl Ketonuria | $(w)$ Defective haemoglobin |
In the given pedigree, indicate whether the shaded symbols indicate dominant or recessive allele.
Mr. Stevan is suffering from haemophilia and cystic fibrosis. His father is hetrozygous for cystic fibrosis. The probability of Stevan's sperm having recessive $X-$linked as well as autosomal allele is