The diagram to the right is called a Punnett square, and is used to predict the possible genotypes of offspring from a specific cross.In the scenario below, a corn plant that is hemizygous for the Bt gene is pollinated by itself or by another hemizygous Bt corn plant. Purebred individual with blue eyes (bb) – Homozygous. This two-trait Punnett square will allow you to calculate both the phenotypic and genotypic ratio of the dihybrid cross. This demonstrates _____ Dominance. ... A cross between homozygous purple-flowered and a homozygous white-flowered pea plants results in offspring with purple flowers. The Punnett square below makes it clear that at each birth, there will be a 25% chance of you having a normal homozygous (AA) child, a 50% chance of a healthy heterozygous (Aa) carrier child like you and your mate, and a 25% chance of a homozygous recessive (aa) child who probably will … One cat carries heterozygous, short-haired traits (Ss), and its mate carries homozygous long-haired traits (ss). Punnett Square Practice Worksheet : For each of the following write whether it is homozygous dominant, heterozygous or homozygous recessive.For each of the following write whether it is homozygous dominant, heterozygous or homozygous recessive. PUNNETT SQUARE CHEAT SHEET Below is a sampling of Punnett Square problems that you will be expected to solve. Genotype: The letters that make up the individual. Punnett Square Terms to Learn. Heterozygous/homozygous. Calculate the probability that an offspring will have the combination DD. 2 x 2 Punnett squares. An example of a Punnett square for pea plants is shown in Figure below.In this example, both parents are heterozygous for flowercolor (Bb).The gametes produced by the male parent are at the top of the chart, and the … Punnett Squares. Every person has 2 copies of certain genes (called alleles ). Mendel's law of segregation. A Punnett square is a chart that allows you to easily determine the expected percentage of different genotypes in the offspring of two parents. There are two possible female gametes (silk/egg), one with the Bt gene, and one without. This biology video tutorial provides a basic introduction into punnett squares. In need of a giant dihybrid cross Punnett square? The trait that shows outwardly in the first (F1) generation (offspring). Complete this Punnett square to show the allele combinations of the possible offspring produced. A Punnett Square is used to help determine which genes a child of 2 parents will have. 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