- Mendel continued to study inheritance patterns while producing hybrid pea plants.
- His next set of experiments involved two traits
- He wondered if the factors for two traits would always appear together or if they segregated independently (would the factor that determines whether a pea plant is tall or short has any thing to do with the plant producing purple flowers)
- WILL A TALL PLANT ALWAYS HAVE PURPLE FLOWERS?
- His first cross was a pea plant that was pure for round and yellow seeds with a plant pure for wrinkled and green seeds.
- The offspring from this cross produced a hybrid that all looked the same:round and yellow seeds. He allowed them to self pollinate
- the F1 generation self pollinated and created new combinations not seen in the parents or F1 generation.
- this showed that the factors that code for seed shape segregate independently from factors that code for seed color
- MENDEL'S LAW OF INDEPENDENT ASSORTMENT - states that allele pairs for different traits separate independently of one another during gamete (sex cell) formation He concluded that different traits are inherited independently of each other, and thus a tall pea plant will not always have purple flowers
- in a monohybrid cross there is a single gene and only two alleles are involved
- in a dihybrid cross, there are two genes and four alleles involves. Each of these allels separate during meiosis
- ONE WAY TO DETERMINE THE POSSIBLE ALLELE COMBINATIONS IS TO NUMBER EACH ALLELE ACROSS FROM THE TOP FROM LEFT TO RIGHT 1-4 and use the following combinations (1,3)(RY)(1,4)(Ry)(2,3)(rY)(2,4)(ry)
- A type of cell division that results in two daughter cells each with half the chromosome number of the parent cell.
- The law of independent assortment states that allele pairs for different traits separate independently of one another during gamete (sex cell) formation
- dihybrid=two genes AND four alleles...........monohybrid=single gene and two alleles
- 1/16
- 9:3:3:1