The SNP mutation responsible for sickle-cell disease changes amino acid 6 in haemoglobin β from glutamic acid (E) to valine (V). 

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#Unit 8. Inheritance Biology

Sex-Linked Characteristics Characteristic determined by a gene or genes on sex chromosomes.

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#Unit 8. Inheritance Biology

X-linked characteristic Characteristic determined by a gene or genes on the X chromosome.  Y-linked characteristic  Characteristic determined by a gene or genes on the Y chromosome. The locus for the blue pigment is found on chromosome 7, and those for the green and the red pigments lie close together on the X chromosome.

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#Unit 8. Inheritance Biology

X-Linked White Eyes in Drosophila

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#Unit 8. Inheritance Biology

Nondisjunction Failure of homologous chromosomes or sister chromatids to separate in meiosis or mitosis.

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#Id: 6343

#Unit 8. Inheritance Biology

X-Linked Color Blindness in Humans 

The human eye perceives color through light-sensing cone cells that line the retina.  Each cone cell contains one of three pigments capable of absorbing light of a particular wavelength: one absorbs blue light, a second absorbs red light, and a third absorbs green light.

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#Id: 6344

#Unit 8. Inheritance Biology