Determining the Unknown Genotype of Corn Plants of the Zea Mays Species from the Phenotypes of Offspring Produced

1274 Words 6 Pages
Scientific Paper
4-10-13
Determining the Unknown Genotype of Corn Plants of the Zea mays Species from the Phenotypes of Offspring Produced
Abstract
No one particular organism is an exact replica of another. Diversity in the world is key for future generations to adapt to the fast changing world. This lab observed the corn plant of the Zea mays species to determine the genotype for the gene of tall versus dwarf in unknown parent corn plants by observing the seedlings produced. It was hypothesized that one parent is heterozygous while the other is homozygous recessive. The predicted results were that half of the seedlings would contain the tall gene and the other half would have the dwarf gene. Plants were grown for two weeks under
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The trait that is inherited by organisms is a carrier of that allele on their chromosome. The dominant allele will determine how an organism looks, and the recessive allele will have no effect on appearance (Reece 2011). The genetic makeup of an organism is called its genotype, and the physical appearance or observable traits of an organism is called its phenotype (Reece 2011). Homozygous organisms contain alleles that are either both dominant or both recessive. Heterozygous organisms posses both a dominant allele and a recessive allele; the dominant allele will mask the effects of the recessive, but they are still a carrier for the recessive gene.
This lab observed the number of corn plants in the Zea mays species that inherited the dwarf trait. The central question is to determine to the genotypes of the parent corn plants of the seedlings that were observed in the lab. At a glance, the ratio of dwarf plants to tall seemed to be one half so, the hypothesis for the genotypes of the parent corn plants are heterozygous and homozygous recessive. By using a punnet square shown in table 1, predictions can be made to determine the ratio of offspring with a specific trait. Crossing a heterozygous corn plant with a homozygous recessive corn plant should result in a 1:1 ratio of tall to dwarf plants.

Table 1: | D | d | d | Dd | dd | d | Dd | dd |

Materials & Methods
The type of plant

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