BIOL 304 Lecture Notes - Lecture 7: Phenylalanine Hydroxylase, Oca2, Epistasis
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Hemophilia (blood clotting disorder): allele combinations, normal xh, hemophilia xh, male y, genotype combinations, normal male xhy, normal female xhxh, xhxh, hemophilic male xhy, hemophilic female xhxh. Red-green color blindness (sex-linked recessive): allele combinations, normal xb, colorblind xb, male y. Examples of polygenic inheritance: height, skin color, eye color. 11-25-2017: body weight, fingerprint patterns, hair color, cholesterol levels. Eye color: human eye color involves the polygenic inheritance of at least 2 genes, each are incompletely dominant, the eye color genes code to produce melanin pigment (yellow- brown pigment) Aa = some pigment aa = no pigment. Bb = some pigment bb = no pigment. Oca2 & herc2: the eye color depends on how much pigment is in the eye, the oca2 gene determines how much pigment gets made, the herc2 gene can turn on and off the oca2 gene. Pleiotropy: pleiotropy occurs when one gene makes a variety of traits.
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According to the multiplication rule of probability, the chance of crossing two pea plants that are heterozygous for height and have none of four offspring showing the recessive short phenotype is:A. ¼ à ¼ à ¼ à ¼. B. ¾ à ¾ à ¾ à ¾. C. (¼ à ¼ à ¼ à ¼) + (¾ à ¾ à ¾ à ¾). D. ¼ + ¼ + ¼ + ¼. E. None of the above. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Females inherit X-linked traits from their maternal parent only. | ||
Females can inherit a gene for an X-linked trait from either parent. | ||
Males inherit X-linked traits from their paternal parent only. | ||
Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers. |
Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers. |