1. On a hillside there are 100 flowering plants. One géne pair controls flower height. Tall (T) is incompletely dominant over short (T). There are 81-tall
, plants,
18 medium plants and-1-short plant. What is the frequeney of each allele in the
populätion?

There are 180 T alleles on the hillside and 20 t alleles.

81 tall plants have two T, 18 medium plants have one T and one t, short plant has two t.  

Explanation:

The tall plants will b TT, medium plants will be Tt, short plant is tt.

The stimulus in the situation is the cold air, this is what incites Dina to return to her house to put a coat on.

The sensory receptors are thermoreceptors, part of the exteroceptors located in the skin (exteroceptive sensitivity).

The response to the stimulus was elaborated by the somatic nervous system (which controls voluntary movements), and it was putting a coat to cover herself from the cold air, by returning at home getting it.