Sex Linked Inheritance

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9 Terms

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XY Sex Determination

  • Females are homogametic (XX), producing X-carrying eggs.

  • Males are heterogametic (XY), producing X- and Y-carrying sperm.

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SRY Gene

The presence of the Y chromosomes that determines maleness, which triggers male development.

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Drosophila melanogaster

Common fruit fly

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XO Sex Determination

  • Females are XX

  • Males have a single X chromosome (XO)

  • The absence of a second sex chromosome in males determines maleness.

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ZW Sex Determination

  • Females are heterogametic (ZW) and determine the sex of the offspring.

  • Males are homogametic (ZZ)

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Haplo-diploid Sex Determination

  • Females develop from fertilized diploid eggs (2n).

  • Males develop from unfertilized haploid eggs (n).

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Parthenogenesis

A natural form of asexual reproduction in which the embryo develops directly from an egg without need for fertilization.

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X-Linked Inheritance

  • Males (XY) express all X-linked traits because they have only one X chromosome.

  • Females (XX) can be homozygous or heterozygous for X-linked traits.

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Y-Linked Inheritance

  • Only males inherit Y-linked traits.

  • Traits are passed directly from father to son.

  • The Y chromosome carries relatively few genes, many of which are involved in male-specific development.