Biology
Grade-10
Easy
Question
Mendel obtained what phenotypic ratio in the F2 generation in his dihybrid cross?
9: 3: 3: 4
9: 3: 3: 1
1: 2: 1
3: 1
9: 3: 3: 4
9: 3: 3: 1
1: 2: 1
3: 1
Hint:
A total of 16 offspring combinations are possible for a dihybrid cross.
The correct answer is: 9: 3: 3: 1
- In dihybrid cross, two different traits are considered at the same time.
- For example, consider two traits: seed color and shape.
- The dominant seeds are yellow and round (YYRR) whereas the recessive seeds are green and wrinkled (yyrr).
- The cross between them produces yellow and round seeds with genotype as YyRr in the F1 generation.
- The F2 generation is obtained by self cross of F1 generation, as follows:
Gametes
YR
Yr
yR
yr
YR
YYRR
YYRr
YyRR
YyRr
Yr
YYRr
YYrr
YyRr
Yyrr
yR
YyRR
YyRr
yyRR
yyRr
yr
YyRr
Yyrr
yyRr
yyrr
- The phenotypes of the offspring are 9 yellow round, 3 round green, 3 wrinkled yellow and 1 wrinkled green.
- Hence, the phenotypic ratio is 9:3:3:1
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