In a simple mendelian cross, true-breeding tall plants (tall is dominant) are crossed with short plants (short is recessive), and the f1 plants, which are all tall, are allowed to self-pollinate. what fraction of the f2 generation are tall?

Considering that T is for the dominant allele
considering that t is for the recessive allele

by test cross you'll get
TT, Tt, Tt, tt

since T is the dominant allele, Tt would mean that the plant is also tall

hence the ratio would be 1:3 (short:tall)

The virus is considered to be are living item since they have hereditary material dnas or rnas. they can imitate and change. they respond to boosts, for example, radiation, chemicals, and warmth. they have antigenic properties. they are proficient to duplicate with a same hereditary constituent.