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Genetic Traits PowerPoint Presentation

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Genetic Traits Presentation Transcript

Slide 1 - Genetic Traits
Slide 2 - Earlobe Attachment
Slide 3 - Some scientists have reported that this trait is due to a single gene for which unattached earlobes is dominant and an attached earlobe is recessive. Other scientists have reported that this trait is probably due to several genes.
Slide 4 - Thumb Extension
Slide 5 - This trait is reportedly due to a single gene; strait thumb is dominant and hitchhiker's thumb is recessive.
Slide 6 - Tongue Rolling
Slide 7 - Tongue rolling ability may be due to a single gene with the ability to roll the tongue a dominant trait and the lack of tongue rolling ability a recessive trait.However, many twins do not share the trait, so it may not be inherited.
Slide 8 - Dimples
Slide 9 - Dimples are reportedly due to a single gene with dimples dominant (people may exibit a dimple on only one side of the face) and a lack of dimples is recessive.
Slide 10 - Handedness
Slide 11 - Some scientists have reported that handedness is due to a single gene with right handedness dominant and left handedness recessive. However, other scientists have reported that the interaction of two genes is responsible for this trait.
Slide 12 - Freckles
Slide 13 - This trait is reportedly due to a single gene’ the presence of freckles is dominant, the absence of freckles is recessive.
Slide 14 - Hair curl
Slide 15 - Early geneticists reported that curly hair was dominant and strait hair was recessive. More recent scientists believe that more than one gene may be involved.
Slide 16 - Allergies
Slide 17 - While allergic reactions are induced by things a person comes in contact with, such as dust, particular foods, and pollen, the tendency to have allergies is inherited. If a parent has allergies, there is a one in four (25%) chance that their child will also have allergy problems. The risk increases if both parents have allergies.
Slide 18 - Hand Clasping
Slide 19 - Some scientists report that there may be a genetic component to this trait while others have found no evidence to support this.
Slide 20 - Colorblindness
Slide 21 - Colorblindness is due to a recessive allele located on the X chromosome. Women have two X chromosomes, one of which usually carries the allele for normal color vision. Therefore, few women are colorblind. Men only have one X chromosome, so if they carry the allele for colorblindness, they will exhibit this trait. Thus, colorblindness is seen more frequently in men than in women.
Slide 22 - End of show…
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