Pfr is the physiologically active forms of Phytochrome

Wild type: short hypocotyl by white light

hy mutant (phytochrome mutant): long hypocotyl by white light

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#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.

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#Unit 8. Inheritance Biology

Narrow-sense heritability

h2 = VA/VP

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#Unit 8. Inheritance Biology

Determining gene number for a polygenic characteristic 

(¼)n

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#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.

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#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.

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#Id: 2083

#Unit 8. Inheritance Biology

Chromosomes are classified into four basic

a. Metacentric chromosome

b. Submetacentric chromosome

c. Acrocentric chromosome

d. Telocentric chromosome