biologynotes3.17

biologynotes3.17 - Man with blood type A can be a father of...

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Man with blood type A can be a father of a child with type O blood. Man with blood type AB can be excluded as the father of a child with type O blood. Man with blood type O can be excluded as the father of a child with type AB blood. Sex-linked genes are carried on sex chromosomes o XX(homogametic sex)-female o XY(heterogametic sex)-male o XX, XO o Birds ZW(female) ZZ(male) Punnett square X Y X XX XY X XX XY Father determines the sex of the child Allele occurs on one of the sex chromosomes In human concerned with X-linked traits Mother determines whether a son displays an X-linked trait X-linked allele for colorblindness o N-normal vision n-colorblindness o XNXN- normal vision female o XNXn- normal vision female but carries colorblindness o XnXn- colorblind female o XNY-normal vision male o XnY- colorblind male Y-linked trait o Always passed from father to son X chromosome o 1098 genes identified Y chromosome is smaller than the X chromosome
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biologynotes3.17 - Man with blood type A can be a father of...

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