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Is the yellowhammer rare?

Is the yellowhammer rare? Yellowhammers are found across the UK. They are least abundant in the north and west and absent from some upland areas, such as the Pennines and Highlands of Scotland, as well as some lowland areas, such Read more…

What is XY in Drosophila?

What is XY in Drosophila? Male and female genitalia in Drosophila are derived from separate cell populations. In male (XY) flies, the female primordium is repressed, and the male primordium differentiates into the adult genital structures. In female (XX) flies, Read more…