Question

Give reasons for the appearance of new combinations of characters in the F2 progeny....

Answer 1

if a tall plant having homozygous genotype is crossed with a dwarf plant having homozygous genotype then the F1 progeny will consist of tall plants with heterozygous genotype;
if the plants in F1 progeny is crossed with each other then three tall plants will be produced and one will be a dwarf planet in the F2 progeny.
Ratio of tall plants and dwarf plant in the F2 progeny is 3:1

Answer 2

Answer:

The reason for the appearance of new combinations in the F

2

generation is given by the law of independent assortment. The law of independent assortment states that:

When two pairs of traits are combined in a hybrid, one pair of character segregates independent of the other pair of character. In a dihybrid cross between two plants having round yellow (RRYY) and wrinkled green seeds (rryy), four types of gametes are produced (RY, Ry, rY, ry). Each of these segregate independent of each other, each having a frequency of 25% of the total gametes produced.