Na dihybrid cross for round and yellow seeds (rryy x rryy), what is the probability of having green and wrinkled seeds?
r=round
r = wrinkled
y = yellow
y = green

1/16

Explanation:

See the Punnett square diagram to observe the result of the cross between the round and yellow plants (RrYy X RrYy).

Since round (R) is dominant over wrinkled (r) and yellow (Y) is dominant over y (green), the plant with genotype rryy would have wrinkled and green phenotype as these are recessive characters.

From the given cross in the Punnett square, we can observe that there is a total of 16 possible progenies and out of these only 1 has the wrinkled and green phenotype.

Therefore the probability is 1/16.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.