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Kitties!

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#29006
Fun:*** (2.5)
Difficulty:*** (2.28)
Category:Science
Submitted By:bigSWAFF_69_Aus******

 

 

 



A female purebred white cat and a male purebred black cat had a litter of 12 kittens. Out of the 12 kittens, all but 3 were black. How many female kittens were there?



Answer

9

x= recessive: white
X= dominant: black

A purebred, female, white cat would have the alleles xx for fur color (white). A purebred, male, black cat would have the alleles YX (black).
The possible allele combinations for offspring are as follows (set up a Punnett Square)

Xx......Yx
Xx......Yx

Every female kitten would be black, with a recessive allele for white fur. Every male kitten would be white. There are 9 black kittens, so that means there are 9 female kittens.

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