Diagram to illustrate over in a cross between a female fruit-fly with white eyes and yellow wings and a male with red eyes and grey wings. The blocks represent the chromosomes in which the two characters are linked with genes are represented by the letters y and w. In this case crossing over between the genes has taken place in 1.5 per cent of the offspring, giving flies with red eyes and yellow wings and white eyes and grey wings respectively, instead of the normal linkage in the parents. (After Morgan).

Diagram to illustrate over in a cross between a female fruit-fly with white eyes and yellow wings and a male with red eyes and grey wings. The blocks represent the chromosomes in which the two characters are linked with genes are represented by the letters y and w. In this case crossing over between the genes has taken place in 1.5 per cent of the offspring, giving flies with red eyes and yellow wings and white eyes and grey wings respectively, instead of the normal linkage in the parents. (After Morgan)

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2545 x 3755 px | 27.3 MB

21.5 x 31.8 cm | 8.5 x 12.5 in (300 dpi)