Biology
Grade-8
Easy
Question
If Y, y, R, r gametes of the F1 generation represent yellow, green, round, and wrinkled phenotypes respectively, and in the F2 generation YR gamete represent yellow round, Yr gamete for yellow wrinkled, yR gamete for green round and yr gamete for green wrinkled.
How many of the off springs in the above cross are heterozygous for yellow round?
- 1
- 3
- 9
- 12
Hint:
When the two alleles of a gene are different, it is called as heterozygous.
The correct answer is: 9
- Gene is the hereditary unit of life made up of two alleles.
- If the two alleles are same then the organism is called homozygous and if the alleles are different, it is called heterozygous
- The recessive character will not be expressed in the presence of a dominant allele
- The heterozygous dominant is expressed as YyRr which will be 9 in number as shown below:
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
| 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 |
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