Genetics is the science of genes and heredity. Inside the nucleus of all your body cells are 23 pairs of chromosomes. Each chromosome carries hundreds to thousands of genes on it. Each gene describes some of your traits. Your hair color, eye color, allergies, body shape, how smart you are, your health, tastes, and on and on. These are all traits described by your genes. The genes describe these traits with a kind of code - a genetic code. The genetic code is found on a double strand all wound around on itself, called, DNA. Heredity is how we pass these coded traits on to our children.(Hide text...)
Predicting Genetics Traits - The Punnett Square
The History of Genetics - How Animals Were Domesticated
The History of Genetics - How Wild Plants Were Domesticated
(New 2013 Life Science Progression Standards)
LS3.A Inheritance of traits
K-2 Young organisms are very much, but not exactly, like their parents and also resemble other organisms of the same kind.
3-5 Different organisms vary in how they look and function because they have different inherited information; the environment also affects the traits that an organism develops.
6-8 Genes chiefly regulate a specific protein, which affect an individual’s traits.
9-12 DNA carries instructions for forming species’ characteristics. Each cell in an organism has the same genetic content, but genes expressed by cells can differ
LS3.B Variation of traits
6-8 In sexual reproduction, each parent contributes half of the genes acquired by the offspring resulting in variation between parent and offspring. Genetic information can be altered because of mutations, which may result in beneficial, negative, or no change to proteins in or traits of an organism.
9-12 The variation and distribution of traits in a population depend on genetic and environmental factors. Genetic variation can result from mutations caused by environmental factors or errors in DNA replication, or from chromosomes swapping sections during meiosis.