Biology
Grade-8
Easy
Question
If in the F1 generation Y, y, R, r gametes 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 homozygous for yellow round?
- 1
- 3
- 9
- 12
Hint:
When the two alleles of a gene are same, it is called homozygous.
The correct answer is: 1
- 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 homozygous dominant is expressed as YR and only one of the offspring will be completely dominant.
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