chapter 13 meiosis

chapter 13 meiosis - Chapter 13 MEIOSIS AND SEXUAL LIFE...

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Chapter 13 MEIOSIS AND SEXUAL LIFE CYCLES Reproduction is an emergent property associated with life. The reproduction of an organism is a consequence of heredity. Zygotes come from the fusion of sex cells, haploid gametes. Heredity o Heredity is the continuity of biological traits from one generation to the next. o Results from the transmission of genes. o When genes are passed on, the ability to reproduce is also passed on, which is an emergent property. o When individuals share similar genes (e.g., offspring, siblings, etc.) they often resemble each other. o Heredity is this continuation of the biological traits through generational time. Genes confer your traits. o Individuals that share similar genes look like one another which is a reflection of inheritance, but there are always going to be differences. Variation o While offspring resemble their parents and siblings there are still some differences. o The mechanism that gives the gametes ensures variation. o Some of these similarities and differences are studied using genetics . o Variation is the inherited differences among individuals of the same species. o Variation occurs because of what happens in the production of the sex cells. Genetics o Genetics is the scientific study of heredity and variation. Offspring acquire genes from parents by inheriting chromosomes Our genome is built of chromosomes and on those chromosomes we have structures that are made from chromatin. Organized on the chromosomes are hundreds and thousands of genes. Those genes and the chromatid are all DNA + Protein. We inherit chromosomes from our parents, giving the 2 sets of diploid chromosomes in the zygotes that organisms begin as. Genes o Specific sequences of nucleotides containing genetic information and are located on chromosomes. o Most genes code for proteins o Each chromosome contains hundreds or thousands of genes. o Each gene is in a specific region or locus o We track traits from one generation to the next. o Most genes carry the info necessary to tell the cell how to build proteins.
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Locus o The exact position of the gene on the chromosome. o You have a set of chromosomes from mom and a similar set from dad. On chromosome 1M, there is a specific loci for genes. On chromosome 1D, the genes are the same kind of gene and located in the same loci and there are different alleles. Sexual Reproduction and the Role of Meiosis A Comparison of asexual and sexual reproduction o Asexual reproduction Involves only one parent. Produces genetically identical offspring to parents Usually used in prokaryotes Offspring are genetically identical to the parent You are a clone. Incredibly little variation that can only come from a mutation. Main Plus-side: No partner needed.
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This note was uploaded on 08/29/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Fall '07 term at LSU.

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chapter 13 meiosis - Chapter 13 MEIOSIS AND SEXUAL LIFE...

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