Two pure lines of plants had mean heights of 26 cm and 42 cm,respectively.The F1 had a mean of 34 cm and a variance of 20.The F2 also had a mean of 34 but a variance of 60.The broad-sense heritability (H2)is:
Two different pure-breeding lines of tobacco were crossed and their F1 showed a variance in flower length of 8.76.The total variance in flower length in the F2 was 40.96.The F1 and the F2 plants were bred,grown,and kept in identical environments.
a)What is the broad-sense heritability of flower length in tobacco in this experiment?
A)8.76% B)21.38% C)32.20% D)78.61% E)The broad-sense heritability cannot be calculated based on these data.
When all of the variation in a population is due to environmental sources and there is no genetic variation,broad sense heritability (H2):
A)is zero and all of the phenotypic variability is due to loci at other locations. B)is zero and all of the phenotypic variability is due to environment. C)is some negative value indicating the phenotypic variability is due to some recessive loci. D)is some positive value indicating the phenotypic variability is due to some dominant loci.