Presentation on theme: "Genetic Traits TEKS 7.14A: The student will define heredity as the passage of genetic instructions from one generation to the next generation. What is."— Presentation transcript:
1 Genetic TraitsTEKS 7.14A: The student will define heredity as the passage of genetic instructions from one generation to the next generation.What is a trait?A trait is a behavioral characteristic or physical attributes of an organism that are expressed by genes and/or influenced by the environment.
2 Bill Nye Science Guy - Genes How Stuff Works? – The Future of Genetic ModificationNeil deGasse Tyson – NOVA, Explains why twins are not identical
6 Genetic Traits (post-homework) Where did these traits come from?From your biological parents. One set of chromosomes from your mom (23) and one set of chromosomes from your dad (23). Which make a total of 46 chromosomes (23 pairs).Prokaryote vs. Eukaryote cells? Remember?Prokaryotic (Archaebacteria, Bacteria, and some protists) do not have genetic material contained in a nucleus, but the genetic material is still present. Eukaryotic (other Protists, Fungi, Plants, and Animals) have genetic material contained in the nucleus.
7 What is a Gene?A gene is a segment of DNA located on each chromosome.Each gene has a particular form.The genetic material is made of an organic compound called deoxyribonucleic acid (DNA).
8 What elements does an organic compound contain? CARBON, and hydrogen, oxygen, nitrogen, phosphorus, and sulfur. SPONCH
9 An allele can either be dominant or recessive. Within the nucleus, genes occur in pairs.An allele is a form of a gene.An allele can either be dominant or recessive.If a dominant allele of a gene is present, the dominant trait will appear (show the phenotype) in an organism. A capital letter is used to represent a dominant allele. (Rr, RR)
10 In order for a recessive trait to appear (show the phenotype), both alleles of a gene must be recessive. A lower case letter is used to represent a recessive allele. (rr)
11 Complete handout: “How do genes determine traits?” And / or Complete “Penny genetics” lab.
12 Scientists use a model called a Punnett Square to predict the outcome of a particular combination of parent traits. They predict the potential genotypes of the offspring of two parents with known genotypes.
13 The genotype is the possible combinations of alleles in a gene. The expression of a gene is called a phenotype. (photo – what you see)The genotype is the possible combinations of alleles in a gene.