Raspberry eyes (ras) is a sex-linked recessive trait in Drosophila. Eyeless (ey) is an autosomal recessive trait and is epistatic to raspberry eyes (no eyes to score). Black body color (b) is an autosomal recessive trait and appears on a chromosome different from eyeless. A wild-type male is crossed to a ras, ey, b homozygous female. The F1 are inbred. In the F2, how often are flies of either sex eyeless and black (and unscoreable for raspberry)?

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Q: Cross #1: P: F1 Fs Homozygous scarlet-eyed males Homozygous brown-eyed females X 1072 Wild-type…

A:

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Q: Cross #1: P: F1 Fs Homozygous scarlet-eyed males Homozygous brown-eyed females X 1072 Wild-type…

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.