Module #11 Assessment #1: Monohybrid and Dihybrid Review
What are the possible genotypes of the tall pea plant in a monohybrid cross?
1. Imagine you have a tall and short pea plant and you wish to cross them. Tall is a dominant trait (T) and short is a recessive trait (t).
1b. What are the possible genotypes of the tall pea plant? Possible Genotype 1: Possible Genotype 2:
Answer:
1b. The possible genotypes of the tall pea plant would be TT and Tt. Tall is a dominant trait, so individuals with at least one copy of the dominant allele (T) would exhibit the tall phenotype.
In a monohybrid cross involving tall (dominant) and short (recessive) pea plants, the possible genotypes of the tall pea plant would be TT (homozygous dominant) and Tt (heterozygous dominant). This means that the tall pea plant can either have two dominant alleles for tallness (TT) or one dominant and one recessive allele (Tt).
Individuals with the genotype TT will always display the tall phenotype due to the presence of two dominant alleles. On the other hand, individuals with the genotype Tt will also exhibit the tall phenotype because the dominant allele overrides the recessive allele in heterozygous individuals.
When crossbred with a short pea plant carrying the genotype tt (homozygous recessive), the possible outcomes for the offspring would all have the genotype Tt and display the tall phenotype.
Understanding the genotypes and phenotypes in monohybrid crosses is essential in predicting the traits of offspring based on the genetic makeup of the parents. By knowing the possible genotypes, we can anticipate the inheritance patterns and variations in subsequent generations.