Understanding The Basis For Biotechnology Research.

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Understanding The Basis For Biotechnology Research

Common Core/ Next Generation Science Standards Addressed! MS ‐ LS1 ‐ 1. Conduct an investigation to provide evidence that living things are made of cells; either one cell or many different numbers and types of cells. [Clarification Statement: Emphasis is on developing evidence that living things are made of cells, distinguishing between living and non-living cells, and understanding that living things may be made of one cell or many and varied cells.] MS ‐ LS1 ‐ 2. Develop and use a model to describe the function of a cell as a whole and ways parts of cells contribute to the function. [Clarification Statement: Emphasis is on the cell functioning as a whole system and the primary role of identified parts of the cell, specifically the nucleus, chloroplasts, mitochondria, cell membrane, and cell wall.] [Assessment Boundary: Assessment of organelle structure/function relationships is limited to the cell wall and cell membrane. Assessment of the function of the other organelles is limited to their relationship to the whole cell. Assessment does not include the biochemical function of cells or cell parts.]

Bell Work! Objective 1: Identify and explain terms associated with genetics. Objective 2: Identify the components of DNA and describe its structure. Objective 3: Explain how DNA is replicated when cells divide.

cell - a basic unit of life containing living material bound by a membrane. The cell also contains genetic material. 1. Within each cell there is a nucleus that contains genetic material. 2. The long molecule that carries the genetic material is DNA or deoxyribonucleic acid. 3. The DNA is organized into tightly coiled strands known as chromosomes. 4. Segments of the chromosomes that code for specific traits of the organism are genes.

Dominant and Recessive Traits The genetic material in the cell determines the appearance of an organism and all chemical processes. 1. Genes that govern variations of the same characteristics and that occupy corresponding locations on the chromosomes are alleles.

Dominant and Recessive Traits 2. Alleles may be dominant or recessive. The trait coded by a dominant allele is always expressed, while those of a recessive allele are only expressed when the two alleles are the same. 3. When the two alleles are the same they are said to be homozygous. When they are different they are heterozygous.

Dominant and Recessive Traits 4. The genetic constitution of an organism is called the genotype. Genotype is most often expressed in symbols. 5. The actual appearance of an organism with respect to the alleles is the phenotype.

Structure of DNA Chromosomes contain long strands of DNA DNA consists of two strands of nucleotides, joined by hydrogen bonds and twisted into a double helix Every DNA nucleotide contains a sugar, a phosphate group, and a base

Nucleotides Bond to Form Double Helix 1. The arrangement of the nucleotides creates a double helix or a twisted ladder appearance. 2. Adenine always pairs with thymine, and cytosine always pairs with guanine.

Mitosis and Meiosis 1. Cellular division resulting in exact duplicate cells is mitosis. 2. Cellular division resulting in sex cells is meiosis.