4.2 Alleles
Sometimes nature produces two three or even more variants (versions) of the same gene. These variants are called alleles. I will try to explain by a diagram..
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBtmAAwekhvuePRTq-7-KogvjTmpxKFGmML9hJGJ95ryZJK10EMz_YWZFdHtCvQw-WEh3v-VMNmxgj3dQB52UoLLlbtu_hYu2XWUPlfhn3nHPscwY4QBzblM3JkBueQMiBVcRippvfor6t/s400/2.1-Alleles.jpg)
To summarize alleles are different versions of the same gene. Only a maximum of two versions may be present in any given bird.
Homework
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Which of the following budgerigars is genetically not possible.
1) A Yellowface type I split to whiteface
2) A Yellowface type II split to golden face
3) A Whiteface blue split to golden face
4) A normal split to yellowface II
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