alleryStart learning →A YyRr plant is self-crossed. How many equally likely genotypic combinations does the Punnett square contain?
AFour combinations
BEight combinations
CSixteen combinations
DSixty combinations
Answer & Solution
Correct answer: C. Sixteen combinations
1. Each parent makes four gamete types: YR, Yr, yR and yr.
2. Arrange those four along the top and the same four down the side.
3. A four by four grid holds sixteen boxes.
4. Each box is one equally likely genotypic combination, so there are 16 of them.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 12 "Mendel's Experiments and Heredity", section 12.3 Laws of Inheritance_
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