inventory of your traits

7/30/2019 Inventory of Your Traits

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Take Inventory ofTake Inventory ofYour Genetic TraitsYour Genetic Traits


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Genes are stretches

of DNA found on chromosomes.

Each gene

codes for adifferentphysical trait.


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The genes you inherit from your parentsdetermine your physical traits.

Genes and traits are considered dominant orrecessive, although in some cases it is notalways clear.


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Dominant traits

occur when only onecopy of the dominantgene is inherited.

Recessive traits areusually rare becauseyou need to inherit a

recessive gene fromboth parents.


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Male or Female?

Your sex is determined by whetheryou get an X or Y chromosomefrom your father. Everyonereceives an X from their mother.

Male (XY) Female (XX)


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Earlobes

Detached earlobes arebelieved to be dominant,

but more than one genemay be involved.

Attached earlobes areconsidered recessive.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=OMIM
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=OMIMhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=OMIM


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Non-rolling

Non-rolling isthought to berecessive.

Tongue Rolling

Rolling

Rolling is thought to bedominant, but identicaltwin studies have castdoubt on this observation.



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Cant move ears =

Recessive

Ear Wiggling

Can move ears =

Dominant (althoughthis may be variable)

Ear wiggling may be connected to tongue rolling in males.



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Dimples

Dimples arethought to be

dominant.

No dimples is

recessive.



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Right Thumb on Top

44% place theirright thumb on top.

Hand Clasping

Left Thumb on Top

55% of peopleplace their leftthumb on top


Hand clasping is believed to be determined by genetic factors,

although it is unclear if one trait is dominant over the other.


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Widows Peak

A widows peak

hairline is considereddominant.

No widows peak is

considered recessive.



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Hair

The presence ofhair on the middlesegment ofanyfinger is dominant.

No Hair

No hair is recessive.

Hair on Middle

Segment of Finger



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Non-tasting is recessive.

25% of individuals findthe paper tasteless.

Phenylthiocarbamide

(PTC) Tasting

PTC tasting is dominant.

75% of individuals cantaste the bitter flavor ofPTC.

PTC is a bitter flavor compound that often causes peopleto dislike certain foods, such as broccoli, coffee, or beer.



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Image Sources:

Chromosomes and Genes: The National Human Genome Research Institute, www.genome.gov

Genes and Inherited Traits: Pearson Education, www.pearsoned.com

Dominant/Recessive Traits: Cooperative Research Centre, www.genecrc.org

Male or Female: The National Human Genome Research Institute, www.genome.govEarlobes: Windows to the Universe, www.windows.ucar.edu

Tongue Rolling, Hand Clasping: Genetic Science Learning Center at the Univ. of Utah, gslc.genetics.utah.edu

Ear Wiggling, Dimples, Cleft Chin, Widows Peak, & PTC Tasting: Microsoft Word Clip Art, office.microsoft.com/clipart/

Hair on Middle Segment of Finger: Koshland Science Museum, www.koshlandscience.org
http://www.genome.gov/http://www.pearsoned.com/http://www.genecrc.org/http://www.genome.gov/http://www.windows.ucar.edu/http://www.koshlandscience.org/http://www.koshlandscience.org/http://www.windows.ucar.edu/http://www.genome.gov/http://www.genecrc.org/http://www.pearsoned.com/http://www.genome.gov/

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