Your phenotype Your friends phenotype Your possible genotypes Your friends

Your phenotype your friends phenotype your possible

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Your phenotype:_________________ Your friends phenotype:_______________
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Your possible genotype(s):____________________ Your friend’s possible genotype(s):____________________ Widow’s Peak If the hairline is pointed over the center of the forehead, the allele for this trait is dominant over the allele for a straight or curved hairline Your phenotype:_________________ Your friend’s phenotype:_______________ Your possible genotype(s):____________________ Your friend’s possible genotype(s):____________________ Free Ear Lobe A free ear lobe means that it is not attached. This trait is controlled by a dominant allele Your phenotype:_________________ Your friend’s phenotype:_______________ Your possible genotype(s):____________________ Your friend’s possible genotype(s):____________________ Bent Little Finger In this trait, the end segment of the little finger bends toward the ring finger when it is placed against a straight edge. This trait is controlled by a dominant allele. If the finger is straight and extend parallel to each other out to the tip, the allele is recessive. Your phenotype:_________________ Your friend’s phenotype:_______________ Your possible genotype(s):____________________ Your friend’s possible genotype(s):____________________ Finger Hair
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Presence of hair on the middle segment of the finger is controlled by a dominant allele. Your phenotype:_________________ Your friend’s phenotype:_______________ Your possible genotype(s):____________________ Your friend’s possible genotype(s):____________________ Hitchhiker’s Thumb The ability to bend the thumb back (without force), so that at one point it may appear slightly parallel with the extended arm, is controlled by a recessive allele. Your phenotype:_________________ Your friend’s phenotype:_______________ Your possible genotype(s):____________________ Your friend’s possible genotype(s):____________________ Interlocking Fingers When clasping the hands together such that the fingers are interlocked, note which thumb ends up on the top naturally. If the left thumb folds over the right, this is controlled by a dominant allele. Your phenotype:_________________ Your friend’s phenotype:_______________ Your possible genotype(s):____________________ Your friend’s possible genotype(s):____________________ ABO Blood types Different blood types result from differences in specific proteins in the blood plasma and on the surface of the red blood cell. The proteins in the plasma of the blood are called antibodies. These substances act upon certain proteins present on the red blood cells called antigens, causing the cells to
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clump together. Antibody A acts on antigen A, so the two are never present together; the same is true for antibody B and antigen B. The inheritance of blood type is controlled by a gene that has three alleles: 1. An allele for the A antigen, designated I A 2. An allele for the B antigen, designated I B 3. An allele for the absence of antigen, designated i IA and IB are dominant over I, but are codominant with respect to each other.
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