The genotype of the parent purple flowered plant. Introduction: An allele is defined as a variant of a gene responsible for coding a specific character. There are atleast two different alleles for each phenotypic characteristics. One allele is dominant while the other form of the allele is recessive. The interaction between the alleles is responsible for different phenotypic traits. These interactions can produce three types of genotypes: homozygous dominant, heterozygous and homozygous recessive. In order to identify the the genotype of the parents, a test cross is designed. In atest cross, the offspring is crossed with the homozygous recessive individual.

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Chapter 16.1, Problem 5CC

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To identify: The genotype of the parent purple flowered plant.

Introduction: An allele is defined as a variant of a gene responsible for coding a specific character. There are atleast two different alleles for each phenotypic characteristics. One allele is dominant while the other form of the allele is recessive. The interaction between the alleles is responsible for different phenotypic traits. These interactions can produce three types of genotypes: homozygous dominant, heterozygous and homozygous recessive. In order to identify the the genotype of the parents, a test cross is designed. In atest cross, the offspring is crossed with the homozygous recessive individual.

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type P = n! (p)* (q)"* х! (n - х)! Practice Problem: You cross a true-breeding pea plant with red flowers to a true-breeding pea plant with white flowers. All of your offspring have red flowers. Which gene is dominant? Why? What is the genotype of your offspring? You then cross the offspring to each other. What ratio do you expect? Why? You count 1000 plants and look at their flowers. Your results are as follows: 740 red 260 white Does this follow a simple Mendelian inheritance pattern? Why or why not? DADT 2 MEA SUDI ND D LUT IONS

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EXAMPLE PROBLEM A plant with orange, spotted flowers was grown in the greenhouse from a seed collected in the wild. The plant was self-pollinated and gave rise to the following progeny: 88 orange with spots, 34 yellow with spots, 32 orange with no spots, and 8 yellow with no spots. What can you conclude about the dominance relationships of the alleles responsible for the spotted and unspotted phenotypes? What can you conclude about the genotype of the original plant that had orange, spotted flowers?