TLS Online TPP Program

#Id: 6840

#Unit 8. Inheritance Biology

Broad - sense heritability

H2 = VG/VP 

TLS Online TPP Program

#Id: 6841

#Unit 8. Inheritance Biology

Broad-sense heritability range from 0 to 1. 

    0 = all the phenotypic variance results from environmental                  variation. 

1 = all the phenotypic variance results from differences in                genotype.

TLS Online TPP Program

#Id: 6842

#Unit 8. Inheritance Biology

Narrow-sense heritability

h2 = VA/VP

TLS Online TPP Program

#Id: 6843

#Unit 8. Inheritance Biology

Determining gene number for a polygenic characteristic 

(¼)n

TLS Online TPP Program

#Id: 6844

#Unit 8. Inheritance Biology

HERITABILITY BY PARENT–OFFSPRING REGRESSION When genetic differences are responsible for phenotypic variance, offspring should resemble their parents more than they resemble unrelated individuals.

TLS Online TPP Program

#Id: 6845

#Unit 8. Inheritance Biology

Limitations of heritability

Heritability does not indicate the degree to which a characteristic is genetically determined. 

An individual does not have heritability. 

There is no universal heritability for a characteristic. 

Even when heritability is high, environmental factors can influence a characteristic. 

Heritabilities indicate nothing about the nature of population differences in a characteristic.