Genetic Traits

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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

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