Brassica Rapa Fast Plant Traits Experiment

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Michelle Kelly July 28, 2010 BIOL 2071 Section 001

Brassica Rapa Fast Plant Traits

By: Tony Nguyen
Group Members: Troy Kessler, Christopher Amo-Quarm

How are traits passed down from one generation to the next? Does the genes from both parent combine into 1 or are the inherited by a whole where 1 is express while the other stays dormant. Using Mendel’s Laws as a base for our experiment, we will determine the expected outcome of these traits to help determine how genes are passed down. We will learn see if genes are randomly passed down and which genes of the parents are more likely to be expressed in the off springs. If the genes are passed down as a whole, then how can we tell which gene is the dominant and the recessive trait. How can reproducing an experiment similar to the pea pod plant can help us answer the question and support our hypothesis? In this experiment we will learn terms and definitions related to Mendel’s Law and comparing the actually experiment’s outcome compared to the data expected by Mendel’s Laws.

Genes are traits that give living things their own certain characteristic. Genes are inherited from the P generation to the F1 generation. As genes are passed down, they are given traits that are either contain all dominant genes known as homozygous dominant, or both dominant and recessive also known as heterozygous and last is homozygous recessive, meaning that the genes are both recessive. Dominant alleles are always present even if they also contain one recessive and the only way to express the recessive trait, both alleles must be recessive for the trait to be expressed. During sexual reproduction, 2 parents with different traits are crossbreed, which encourage cultural diversity out of the population. The offspring of the P1 generation is also call the hybrid since they have a mixed of traits from both parents. There are 2 type of crossbreeding first is monohybrid where a single trait is cross while dihybrid contains 2 traits that are crossbreed. Last there is genotype, which is the generic code that is passed on from generation and phenotype that is a physical characteristic of an organism (Duncan 2010). The person to question this was Mendel who later did an experiment on pea pod plants to see which characteristic was pass down to the next generation.

Gregor Mendel was conducting research about heredity. “In 1856, Mendel performed his first set of hybridization experiments with pea plants in the monastery garden at Brno, Moravia” (Cummings c2007), and discovered the nature of gene inheritance in which he created 2 Laws. The first law is called the Law of Segregation, Mendel stated “…in the process of the formation of the gametes the pairs separate, one going to each gamete, and that each gene remains completely uninfluenced by the other.” (Anonymous 2008). Due to having a dominate alleles AA bred with a recessive aa and ending up getting Aa for all 4 off springs. The second law Mendel founded was the Law of Independent Assortment, which states, “…Characteristics are inherited independently of each other…” (Anonymous 2008), which means the dominant traits can be shown with another trait that is either dominant or recessive. Mendel tested his laws with the pea pod plants by observing the plants height and peas shape and color, by using a homozygous dominant and homozygous recessive plant, to see what alleles are being passed down to the F1 generation and repeated to experiment to the F2 generation. Mendel then measured the genotype and phenotype of the plants and using the pumice square supported his hypothesis.

The purpose of this lab is to test whether traits are passed down generation as a whole, causing the hybrid to either have the dominant or recessive traits to be expressed. In our experiment we will test whether Mendel’s 2 laws are correct, so we are going to begin by planting fast plants. The plant bred...
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