BIOL 202 Lecture Notes - Chi-Squared Distribution, Albinism, Red Color

22 views10 pages

ceruleanprairie-dog589

21 May 2012

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

By comparing the wild type species, which is found naturally, to a genetic mutant, it is possible to observe phenotypes. Prior to mendel, genetics was governed by a rule known as blending inheritance: in this theory, the offspring of a parent are a genetic mixture of both parents. For example, the child of a small mother and tall father would have a medium height: this theory was later disproved by mendel. Mendel chose to study the inheritance of characters, called phenotypes, whose expression is strong (usually visible) and strongly influenced by gene action. There are two types of crosses which mendel used on his pea plants: cross pollination involves transferring pollen of one flower"s anthers to the stigma of another flower. The anthers are cut off the receiving flower to ensure that it doesn"t pollenate itself: selfing is when the pollen of one flower are brushed onto its own stigma, which is essentially crossing the slower with itself.

Related Questions

Choose a trait that goes beyond Mendelâs one trait inheritance. Discuss the inheritance (ex. Incomplete dominance, multiple allele, polygenic, pleiotrophy, linkage, environmental influences), the different phenotypes or anything else that deviates from simple genetics. Mendel got lucky with the traits he chose in his pea plants. If he got more complicated traits and inheritance it would have made his findings almost impossible to come to. Talk about how these traits would have made it hard for scientists like Mendel to figure out inheritance the way he did.

1. Compare and contrast epigenetic, Mendelian genetic and Lamarckian theories of inheritance.

2. Discuss how it is possible that in your body, every cell has identical DNA and the same genes, yet these cells may have very different phenotypes and functions throughout the body (for example, in your body, a neuron and cardiac muscle cells have the same genes, yet very different functions and appearances).

whiteelk18

Match the following definitions with the correct term. (We have not yet cover all of them in class, but you can find them in your reading.)