3.21b Genetic Probabilities

1. f1 offspring cross with an f1 offspring. 
2. The parent phenotype is red petal crossed with red petal 
3. The parent genotype- Rr x Rr
4. Both parents are heterozygous. 
5. Meiosis takes place and the allele has to be separated, one into each type of gamete. 
6. In this case, there is a 50% chance that the pollen grain is carrying a R allele and there's a 50% chance that the pollen grain is carrying an r allele. 
7. Random fertilization occurs, as shown in the table, to be observed in the image. 
8. The probabilities depend on which pollen grain (R or r) fertilizes with which ovule (R or r)