Draw a punnett square illustrating the cross

Reference no: EM133434450

This activity builds on two concepts: Mendelian genetics and chi-squared analysis. Follow the example in Using chi-square with Mendelian Genetics as a guide to completing this assignment.

You notice that a population of puppies comes with two different types of fur. Some puppies have thin fur, and some puppies have thick fur. You ask the breeder and find out that thick fur is dominant over thin fur. You wonder if this heritable trait follows Mendelian genetics. You ask the breeder to cross a parental generation (P) homozygous dominant dog with a homozygous recessive dog to produce several first generation (F₁) offspring that will be heterozygous.

1. Draw a Punnett square illustrating the cross between the P generation homozygous dominant and homozygous recessive dogs. Give the genotypic and phenotypic ratio of the F₁ offspring.

After this F₁ generation of puppies has grown up, you ask the breeder to cross two of the heterozygous dogs to produce a second generation (F₂).

2. Draw a Punnett square illustrating the cross between the F₁ generation heterozygous dogs. Give the expected genotypic and phenotypic ratio of the F₂ offspring produced by this cross, assuming they follow Mendelian genetics.

Next, you count the number of F₂ puppies with thick or thin fur. The litter was quite large, and produced 18 puppies! Of these 18 puppies, 15 had thick fur and 3 had thin fur.

3. List your null and alternative hypotheses.

4. Create a chi-square table. Fill out the observed values, expected values, observed minus expected, (O-E)², and (O-E)² / E columns. Calculate your chi-square value. Calculate your degrees of freedom. Find the chi-square value from Table 1. Compare your chi-square value to the chi-square value from the table. Did you reject or fail to reject your null hypothesis? Did your puppies follow Mendelian genetics?

Reference no: EM133434450

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