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4.Principles of Inheritance and Variation
normal
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?
A
$I$ and $III$
B
$I$ and $IV$
C
$II$ and $III$
D
$II$ and $IV$
Solution
Condition $I$ cross between $Gg$ and $gg$
Condition $II$ Cross between $Gg$ and $Gg$
So, strain $II$ and strain $IV$ are heterogametic $(Gg)$
Standard 12
Biology
