1. Mendel’s Genetic Experiments with Pea Plants

2. (second filial generation)
tall
short P1
(parental
generation) X
cross pollination F1
(first filial
generation)
all tall
(hundreds)
self pollinate
produced a ratio of tall:short, 3:1
(for hundreds of offspring) F2
(second filial generation)
tall
tall
tall
short

3. Mendel’s Theory of Genetics Dominant and Recessive Alleles
For the trait height in pea plants, T = tall and t = short.
If a plant has a T allele and a T allele (TT), would it be tall or short?
tall
If a plant has a T allele and a t allele (Tt), would it be tall or short?
If a plant has a t allele and a t allele (tt), would it be tall or short?
short

4. TT tt T t T t T T T t T t t t P1 F1 F2 tall short purebred X purebred
hybrid
all tall X
tall T T T t T t t t F2
tall
tall
tall
short