Phytochromobilin is exported from the plastid to the cytosol where it autocatalytically attaches to the PHY apoprotein through a thioether linkage to a cysteine residue.

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#Unit 8. Inheritance Biology

EVOLUTION OF THE Y CHROMOSOME

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Dosage compensation

Equalization in males and females of the amount of protein produced by X-linked genes.

Each female cell one of the two X chromosome becomes inactive. Which X chromosome is inactivated is random.

The Xist (X inactive specific transcript) gene located on the X chromosome, in required for inactivation. 

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Barr body- Inactivated X chromosome that appears as a condensed, darkly staining structure in most cells of female placental mammals. 

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#Unit 8. Inheritance Biology

Number of Barr bodies

Differential expression of a gene that depends on the sex of the parent that transmitted the gene.

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Genetic Maternal Effect 

Determination of the phenotype of an offspring not by its own genotype, but by the nuclear genotype of its mother. 

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#Unit 8. Inheritance Biology