Chapter 4 vocab ● Behavior geneticists study our differences and analyze the effects of heredity and environment (every nongenetic influence, from prenatal nutrition to the people and things around us) ● We have 46 chromosomes (threadlike structures made of DNA molecules that contain our genes.) 23 from each parent. DNA is the molecule that contains our genetic information. Genes, small segments of DNA, are the biological units of heredity that make up the chromosomes; a segment of DNA capable of synthesizing a protein. When genes are turned on, they provid the code for creating protein molecules, our body’s building blocks. The genome is the complete instrucyions for making an organism, consisting of the genetic material in that organism’s chromosomes. ● Identical twins develop from a single fertilized egg that splits in two. They are genetically identical. They have the same genes, but they don’t always have the same number of copies of those genes. Some have different sets of placenta.
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