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About this document
- Pages
- 33 pages
- Price
- $33 one-time, yours to keep
- Membership
- Included in every plan
- Format
- Subject
- Biology, Genetics
- Module
- Module 2
This document covers classical genetics, also known as transmission genetics or Mendelian genetics. It explains the principles of inheritance of characteristics at the whole organism level, focusing on Gregor Mendel’s experiments with pea plants. It is useful for understanding the basics of genetics and how traits are passed down.
What's inside
- Introduction to classical genetics
- Gregor Mendel's experiments and conclusions
- Mendel's laws and principles
- The monohybrid cross and Punnett Square
- Sex determination and sex linkage
Who it is for: Students studying genetics, especially those in Module 2. (Undergraduate)
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Summary
Classical genetics is the study of inheritance of characteristics at the whole organism level. It covers Mendel's work on pea plants, monohybrid and dihybrid crosses, and genetic variation.
Mendel's experiments and conclusions
Mendel studied inheritance in pea plants. He investigated simple traits and controlled the plants' reproduction. He made several conclusions from his experiments about how characteristics are inherited.
The monohybrid cross
A monohybrid cross is a breeding experiment involving just one characteristic. Mendel's First Law explains how alleles segregate during meiosis. A Punnett Square shows the possible results of fertilisation.
Genetic variation and inheritance
Genetic variation can be studied by measuring characteristics in individuals. Variation can be discontinuous or continuous. Independent assortment and crossing over in meiosis contribute to genetic variation.
Polygenic inheritance
Polygenic inheritance involves multiple genes controlling a single characteristic. Examples include coat colour in rabbits and skin colour in humans. The number of dominant alleles affects the phenotype.
Key terms
- monohybrid cross
- A breeding experiment involving just one characteristic.
- dihybrid cross
- A breeding experiment involving two characteristics.
- phenotype
- The outward appearance of an organism.
- genotype
- The genetic makeup of an organism.
- alleles
- Different versions of the same gene.
- independent assortment
- The random mixing of maternal and paternal chromosomes in meiosis.
Questions this document helps with
- What are the differences between a monohybrid and a dihybrid cross?
- How do alleles determine an organism's phenotype?
- What causes genetic variation in a population?
Summary written with AI from the document's text.
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