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How is gender determined?

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This article explores how gender is determined through sex chromosomes, specifically in the context of fruit flies. Females possess XX chromosomes while males have XY. Focusing on sex-linked traits, we analyze eye color, where red (XR) is dominant and white (Xr) is recessive. A cross between a heterozygous female (XRXr) and a recessive male (XrY) is examined using a Punnett square to illustrate potential offspring phenotypes. The results show the expected ratios of red and white females and males, enhancing our understanding of inheritance patterns.

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How is gender determined?

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  1. How is gender determined? Sex-linked traits

  2. Sex Chromosomes • Females = XX • Males = XY

  3. Sex-linked Genes are on the X • Eye color is a sex linked trait in fruit flies; Red is dominant over white; show the cross of a heterozygous females and a recessive male • Define alleles: XR = red; Xr = white • Show parents: XRXr x XrY • Do the punnet square: • GR: 1XRXr: 1XrXr: 1XRY:1XrY • PR: 1 red female: 1 white female: 1 red male: 1 white male

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