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In , Nettie Stevens and Edmund Wilson independently discovered that male animals possess one chromosome that is shorter than its partner, whereas female animals instead have two long chromosomes. Rosalind requires your browser to be JavaScript enabled. The results of Morgan's expermients demonstrate that eye color must be encoded by a recessive allele on the X chromosome. The remaining homologous chromosome pairs are called autosomes. Chromosomes Determine Sex Figure 1. Topics : Heredity , Probability. More specifically, the factor for white eye color is encoded by a recessive allele on the X chromosome.

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The results of Morgan's expermients demonstrate that eye color must be encoded by a recessive allele on the X chromosome.

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The remaining homologous chromosome pairs are called autosomes. One of Morgan's many experiments with fruit flies genus Drosophila began as he noticed a number of white-eyed males. Sex chromosomes are still passed on to gametes based on the outcome of a coin flip, but egg cells deriving from females must always possess an X chromosome, so that the sex of an individual is determined by whether it receives an X or a Y chromosome from its father's sperm cell.

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