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sex-linked traits

sex-linked traits. Sex chromosomes carry genes that code for traits other than gender . Traits determined by genes on the X chromosome are called sex-linked traits . (hemophilia and colour blindness). A male has XY homologous chromosomes for sex determination.

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sex-linked traits

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  1. sex-linked traits

  2. Sex chromosomes carry genes that code for traits other than gender. Traits determined by genes on the X chromosome are called sex-linked traits. (hemophilia and colour blindness) A malehas XY homologous chromosomes for sex determination. A femalehas XX homologous chromosomes for sex determination.

  3. x y • Receives sex-linked chromosome from • mother(give the X) • Phenotype will show sex-linked gene • because no other allele to mask it.

  4. x x • Can inherit sex-linked traits from either parent. • Must have two sex-linked alleles to show recessive trait. • If receives one recessive sex-linked allele, she will not show the trait, but she is a carrier.

  5. X Y Father = XY Mother = XX X X ¼ color-blind male – 25% X X Y X ½ disorder free – 50% ¼ female carrier – 25% X X Y X

  6. A pedigree is a diagram representing the phenotype history of a family. Genotypes can be determined by analyzing the pedigree. Symbols: Male – square Female – circle Dominant trait – blank Recessive trait – filled

  7. A widow's peak hairline (W) is dominant over a straight hairline (w): ww W W W w w w ww ww W w W ? W w ww ww W ?

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