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A cross of sweet peas showing that independent assortment does not always occur
Roe deer fawn, two to three weeks old.
18 weeks old human fetus
The photo shows an ultrasound image of a fetus of about 20 weeks’ gestational age.
Control of the cell cycle by cyclin-dependent kinases, and the checkpoints at which they operate
The frequency of aneuploidy changes dramatically over developmental time. Between 6 to 8 weeks and 2