Genes are the basic unit of inheritance by which characteristics are passed on from one generation to another



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Naturally Curly Hair

  • There are two versions of the hair type gene, curly (C) and straight (s). Hair type is an example of incomplete dominance.

  • If you have one of each version of the gene, you get a mix of the two or wavy hair. So for hair type, CC gives curly, Cs gives wavy and ss gives straight hair.

  1. Color Blindness

  • Traits that are determined by alleles carried on the X chromosome are referred to as X-linked. X-linked alleles require a specific notation: Xc  (recessive allele) or X+ (Dominant allele). 

  • Females will have two X-linked alleles (because females are XX), whereas males will only have one X-linked allele (because males are XY).

  • One example of an X-linked trait is red-green colorblindness.

  • Females that are X+X+ or X+Xc have normal color vision,

  • Females that have XcXc  are colorblind.

  • Males that are X+Y have normal color vision

  • XcY males are colorblind.

(Xc) -recessive allele that causes colorblindness



(X+)- the normal dominant allele.

  1. Hand Clasping

  • Most people place their left thumb on top of their right and this happens to be the dominant phenotype.

  • Right thumb on top of left thumb is recessive.




References


  • http://knowgenetics.org/dominant-inheritance/

  • http://thehappyscientist.com/science-experiment/ear-genes

  • http://genetics.thetech.org/ask/ask125

  • https://ghr.nlm.nih.gov/primer/traits/handedness

  • http://www.brighthub.com/science/genetics/articles/13998.aspx

  • https://www.google.com/search?q=how+to+determine+pattern+of+inheritance+for+cleft+chin&biw=1920&bih=953&source=lnms&tbm=isch&sa=X&ved=0ahUKEwii5uio7cXSAhWG1IMKHSd9B1oQ_AUICCgB#imgrc=9odPT3uTRB2HRM:

  • http://genetics.thetech.org/ask/ask45

  • http://www.scienceprofonline.com/genetics/ten-human-genetic-traits-simple-inheritance-2.html

  • http://knowgenetics.org/x-linked-inheritance/

  • http://learn.genetics.utah.edu/content/basics/observable/



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