On the basis of Mendel’s observations, predict the results from the following crosses with peas: 

(a) A tall (dominant and homozygous) variety crossed with a dwarf variety; 

(b) The progeny of (a) self-fertilized; 

(c) The progeny from (a) crossed with the original tall parent; 

(d) The progeny of (a) crossed with the original dwarf parent.