2 - Biol 241 2008 Lecture 2: Mendelian Genetics: I) The...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Biol 241 - 2008 Lecture 2: Mendelian Genetics: I) The concepts of heredity before Mendel A) Homunculous: a preformed human embryo in gametes. B) Blended inheritance: Parental traits are mixed and stably changed in the offspring. This was popular as biologists at the time were fascinated with Darwin’s theory of evolution. Darwin dealt with complex traits that are affected by many genes. These complex traits exhibit variations that seem continuous. II) The pea plant The first model organism. A) The garden pea, Pisum sativum , grows rapidly and easily. B) Peas are highly inbred because the tightly closed flowers prevent pollen from leaving or entering. This led to a variety of peas that “ breed true ” or are “ true- breeding ”, that is each successive generation is very much like the parents. A high level of homozygosity in most/all pea genes caused by repeated self- fertilization. C) Experimentally, peas can be made to cross with other pea plants by delivering pollen directly to the stigma of the flower. III) Monohybrid crosses A) 7 characteristics in the pea plant that were distinctly different. He had varieties (strains) of his pea plant that bred true for each characteristic. 1)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/09/2010 for the course BIOL 241 taught by Professor Henrychang during the Spring '10 term at Purdue University-West Lafayette.

Page1 / 2

2 - Biol 241 2008 Lecture 2: Mendelian Genetics: I) The...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online