Question

In a dihybrid cross, a pure-bred purple elongate radish variety was crossed with a pure-bred white round radish variety. All F1 radishes were purple and round.
When F1 plants were selfed, the F2 population showed the following phenotypes; 39 purple elongate : 80 purple round : 41 white round. How would you explain this segregation ratio?

A. White and elongate alleles are dominant; allele for white is genetically linked to allele for elongate

B. Purple and Round alleles are dominant; allele for purple is genetically linked to allele for elongate

C. Purple and white alleles are semidominant; Round allele is dominant to elongate allele

D. Purple and white alleles are codominant; round and elongate alleles are also codominant

Which of these are true about heterospory? Choose all that apply.

A.same spore can give rise to either male and female gametophytes
B.heterospory first appeared in Lycophytes
C.there are megaspores and microspores
D.at least some species in all land plant phyla show heterospory
E.spores are produced in many different shapes and sizes
F.Heterospory paved the way for plants to evolve seeds
G.Different plants bear female and male spores