Biology / Unit 5 Bio 0991 short lesson, about 20 seconds
Random Fertilization as a Source of Genetic Variation
Captions available
The idea
Random fertilization combines one of many possible gametes from each parent, multiplying the genetic variation crossing over and independent assortment already produced.
In practice
Two parents each capable of over eight million distinct gametes can produce a zygote drawn from over seventy trillion combinations.
Where people slip
Random fertilization multiplies variation meiosis already generated — it is not itself a meiotic event.
Your place on the trail
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