The colour of a mouse’s fur is controlled by a single pair of alleles.
A mouse with black fur was crossed with a mouse with white fur. All the offspring had black fur.
What would be the most likely ratio in several litters of offspring if two of these black offspring were crossed?
1 )
black fur:1 / white fur:3
2 )
black fur:2 / white fur:2
black fur:3 / white fur:1
4 )
black fur:4 / white fur:0
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