Why a person who is blood type 0- can donate blood to anytype but can receive only from indivudual who are also blood type 0-

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

Ais a group of individuals of the same that exist together in the same place at the same time

Each hereditary trait corresponds to