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Standard X
Biology
Question

The phenotypic ratio obtained by crossing a heterozygous parent (YyRy) with a recessive parent (yyrr) is:
  1. 3 : 1
  2. 1 : 1 : 1 : 1
  3. None of the above
  4. 9 : 3 : 3 : 1

A
1 : 1 : 1 : 1
B
None of the above
C
3 : 1
D
9 : 3 : 3 : 1
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Solution
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Parent 1: YyRr
Gametes: YR, Yr, yR, yr
Parent 2: yyrr, will produce all same gametes - yr
So, YyRr x yyrr:
Gametes YR Yr yRyr
yr YyRr Yyrr yyRr yyrr
Only four phenotypes will be observed in the progenies.
So, the phenotypic ratio will be 1:1:1:1
Thus, the correct answer is option C.

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