Fraternal twins are produced when
A fertilized egg divided into two
An egg is fertilized by two sperms
A divided egg has two set of chromosomes
Two eggs are fertilized simultaneously
A medical technician while observing a human blood smear under the microscope notes the presence of barrbody close to the nuclear membrane in the $WBC$. This indicates that person under investigation is
Which of the following is not a hereditary disease?
Term 'genetics' was given by
Edward's syndrome, Patau's syndrome and Down's syndrome are due to
$A$ : Polyploids with odd number of chromosomes are propagated vegetatively.
$R$ : Seed formation is absent due to meiotic abnormality.