Question

Evaluating your phenotypes and genotypes and testing a genetic hypothesis in corn There are two activities in this write up. In the first, you will evaluate your phenotypes and genotypes and relate them to parental phenotypes and genotypes. In the second, you will test a hypothesis using a monohybrid cross in corn and carry out a Chi-squared analysis. For the write up, please copy and paste the remaining part of the Lab document into a new document, then fill in with your responses and images. I have highlighted where a response is needed in yellow. Submit your completed write up to the Dropbox. Human Genetic Traits You will evaluate your phenotype and genotype for a small number of human traits that follow Mendelian inheritance. 1. Decide if you have the dominant or recessive trait for each phenotype 2. Record your genotype as best you can, using D for the dominant allele and d for the recessive allele. Remember, if your phenotype is dominant, you may be homozygous dominant or you may be heterozygous. Your phenotype alone is insufficient to differentiate between the two possible genotypes, so you should represent the second allele with a question mark. Table 1. Your Phenotype and Genotype for Mendelian traits. Characteristic Your Your D for dominant allele Phenotype Genotype d for recessive allele Hairline widow's peak (D) continuous hairline (d) Thumb last segment straight (D) last segment bends 60° (d) Little finger bends toward ring finger(D) straight (d)

Answer 1

Evaluating your phenotypes and genotypes and testing a genetic hypothesis in corn There are two activities in this write up. In the first, you will evaluate your phenotypes and genotypes and relate them to parental phenotypes and genotypes. In the second, you will test a hypothesis using a monohybrid cross in corn and carry out a Chi-squared analysis. For the write up, please copy and paste the remaining part of the Lab document into a new document, then fill in with your responses and images. I have highlighted where a response is needed in yellow. Submit your completed write up to the Dropbox. Human Genetic Traits You will evaluate your phenotype and genotype for a small number of human traits that follow Mendelian inheritance. 1. Decide if you have the dominant or recessive trait for each phenotype 2. Record your genotype as best you can, using D for the dominant allele and d for the recessive allele. Remember, if your phenotype is dominant, you may be homozygous dominant or you may be heterozygous. Your phenotype alone is insufficient to differentiate between the two possible genotypes, so you should represent the second allele with a question mark. Table 1. Your Phenotype and Genotype for Mendelian traits. Your Phenotype Your Genotype straight dd hairline Characteristic D for dominant allele d for recessive allele Hairline widow's peak (D) continuous hairline (d) Thumb last segment straight (D) last segment bends 60° (d) Little finger bends toward ring finger(0) straight (d) bends 60° dd bends DD or Dd Since we inherit our genes from our parents, our own genotype predicts the genotypes of our parents. Use the following table to predict the possible genotypes of two parents based on a child's genotype for these traits. If we also know the parents' phenotypes, we could narrow it down even more, in some cases. All of them are autosomal traits. One example is filled in for you. Child's genotype Parent 1 possible genotypes if has dominant trait DD or Dd Dd or DD not possible Parent 1 possible Parent 2 possible genotypes if has genotypes if has recessive trait dominant trait Not possible DD or Dd dd DD or Dd dd not Parent 2 possible genotypes if has recessive trait Not possible dd dd DD Dd dd Testing a genetic hypothesis in corn Experimental Question: Do purple and yellow corn kernel colors follow Mendelian laws of inheritance Predictions related to the experimental question: Fill in the Punnett Square for a cross between two heterozygous purple kernelled plants P P P PP Pp PP р Рp if purple and yellow kernel color follow Mendelian inheritance and Purple kernel color is dominant, then a cross between two heterozygous parents for this trait will have 374 fraction of purple offspring and 1/4 fraction of yellow offspring Now fill the table with the probability of possible offspring outcomes. Table 1 Trait Probability (fraction) Purple

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