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How is gender determined?

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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