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STD 12 - 4. principal of inheritance and variation — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
From a cross $Aa\ BB × aa\ BB$, following genotypic ratio will be obtained in $F_1$ generation
  • ✓
    $1\ Aa\ BB : 1\ aa\ BB$
  • B
    $1\ Aa\ BB : 3\ aa\ BB$
  • C
    $3\ Aa\ BB : 1\ aa\ BB$
  • D
    All $Aa\ BB$ : No $aa\ BB$
✓

Answer

Correct option: A.
$1\ Aa\ BB : 1\ aa\ BB$
a
(a)  $AaBB × aaBB$

Gametes for $F_1 = AB, aB$ and $aB, aB$

After crossing $= AaBB, aaBB$

Ratio $= 1 : 1$

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