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A metafemale sounds super cool, but it usually does not fully develop.

A ratio less than one-to-one could produce an intersex fly that's between a male and female with characteristics of both.

Generally speaking, a ratio of X chromosomes to autosome sets equal or greater to one produces a female, while a ratio less than one produces a male.

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Because the Y chromosome does not determine sexuality, we are not including it on this table.

In this lesson, we'll learn about what makes normal male and female flies, as well as the super-normal!

In today's lesson, we'll start with doing a little comparison between humans and fruit flies.

Although much of animal development is conserved, and there are identifiable patterns of gene expression that flies and humans share, sex determination is one area where the two have distinct differences.

While the presence of a Y sex chromosome is what makes a human male a male, a Y chromosome does not determine sex in flies.

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