In Drosophila, the allele for a normal grey body colour $G$ is dominant to ebony body $g.$ The following table summarises the results of several crosses
S.No | Cross | Result |
$I.$ | Strain $1 \times$ gg | All wild type |
$II.$ | Strain $2 \times$ gg |
$1$ wild type $:\;1$ ebony |
$III.$ | Strain $3 \times$ gg | All ebony |
$IV.$ | Strain $4 \times$ Gg |
$3$ wild type $:\,1$ ebony |
Which strains both have the genotype Gg?
$I$ and $III$
$I$ and $IV$
$II$ and $III$
$II$ and $IV$
With the help of an example, differentiate between incomplete dominance and co dominance.
An abnormal human baby with $‘XXX’$ sex chromosomes was born due to
$A$ normal woman, whose father had colour blindness, married a normal man. What is the chance of occurrence of colour blindness in the progeny?
If interference is complete or cent percent then the frequency of observed double crossover will be
Which of the following human diseases provides an example of sex linked inheritance