All sons of a couple are colourblind because

  • A

    Mother is homozygous colourblind

  • B

    Mother is heterozygous and father normal

  • C

    Mother is heterozygous and father colourblind

  • D

    Mother is normal and father colourblind

Similar Questions

Symptoms representing a particular disease due to chromosomal abnormalities are referred to

Choose incorrect statement for haemophilia.

:Match the columns :

Column $I$
 
Column $II$
 
$(1)$ Albinism $(p)$  recessive gene
represented by
HbsHbs.
 
$(2)$ Phenyl 
Ketonuria
$(q)$ recessive gene
represented by cc.
$(3)$ Sickle cell 
anaemia
$(r)$ recessive gene
 represented by aa.
 
$4)$ Alkaptonuria $(s)$ recessive gene
represented by pp

Explain thalassemia.

Mendelian disorder may be of