1 / 7

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.

saburo
Download Presentation

sex-linked traits

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 ?

More Related