To determine the genotypes of the parents based on the F1 results of 155 tall peas and 45 short peas, we can use the concept of Mendelian genetics.
1. Given that the F1 generation resulted in 155 tall peas and 45 short peas, we can infer that the tall trait is dominant (T) and the short trait is recessive (t).
2. From the results, we can deduce that the tall peas have a genotype of Tt (heterozygous) because the tall phenotype (155) includes both homozygous dominant (TT) and heterozygous (Tt) genotypes.
3. The short peas must have a genotype of tt (homozygous recessive) because the short phenotype (45) is only possible with this genotype.
Based on this information, the genotypes of the parents can be deduced as follows:
- One parent must have a genotype of Tt (heterozygous) because it can produce both tall and short offspring.
- The other parent must have a genotype of tt (homozygous recessive) because it only produces short offspring.
Therefore, the genotypes of the parents in this cross would be:
- Parent 1: Tt
- Parent 2: tt
