In pea plants, seed colour is determined by a single gene. The allele for yellow seed colour, $Y$, is dominant, whereas the allele for green seed colour, $y$, is recessive. What are the possible genotypes of a pea seed that is yellow?
- A$YY$ or $yy$ only
- B$YY$, $Yy$ or $yy$
- C$YY$ or $Yy$ only
- D$Yy$ or $yy$ only