Wikipedia says:The Punnett square is a diagram that is used to predict an outcome of a particular cross or breeding experiment. It is named after Reginald C. Punnett, who devised the approach. The diagram is used by biologists to determine the probability of an offspring having a particular genotype. The Punnett square is a tabular summary of possible combinations of maternal alleles with paternal alleles.[1] These tables can be used to examine the genotypic outcome probabilities of the offspring of a single trait (allele), or when crossing multiple traits from the parents. The Punnett Square is a visual representation of Mendelian inheritance. It is important to understand the terms "heterozygous", "homozygous", "double heterozygote" (or homozygote), "dominant allele" and "recessive allele" when using the Punnett square method. For multiple traits, using the "forked-line method" is typically much easier than the Punnett square. Phenotypes may be predicted with at least better-than-chance accuracy using a Punnett square, but the phenotype that may appear in the presence of a given genotype can in some instances be influenced by many other factors, as when polygenic inheritance and/or epigenetics are at work.
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The net you are referring to is called a square pyramid net. It consists of four triangular faces and one square base. When the net is folded along its edges and assembled, it forms a three-dimensional square pyramid shape.
A net of a triangular-based prism.
A square-based pyramid net consists of a square base with four isosceles triangle faces extending from each side of the square. The triangles meet at a single point at the top of the pyramid. When the net is folded and assembled, it forms a three-dimensional square-based pyramid shape.
The diagram, or net of a cube shows what the cube would look like unfolded and also shows the surface area.A square is just a square; a 2-dimensional object, whereas a cube is a 3-dimensional object. But the net of a cube couldhave squares, if you were to look at each single unit of the net of the cube.
That is because a cube has six square faces.