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Lesson Outline Introduction Concept 1: Sexually reproducing organisms make sex cells or gametes. Concept 2: Genes are stable, passed on in sex cells and control traits Concept 3: Genes are a part of the chromosome and are found in pairs in somatic cells. Concept 4: Genes can change on occasion and the alternative version or allele may control the trait Concept 5: Individuals can be homozygous or heterozygous. Concept 6: Gene pairs associate and then separate during gamete formation Concept 7: Gametes combine at random to form the individuals in the next generation. Concept 8: One allele can be dominant over another or show a lack of dominance. Concept 9: The segregation of genes allows geneticists to make predictions. Concept 10: Segregation can be predicted based on independent assortment.

Just the facts Rate Me 1 2 3 4 5 Concept 7: Gametes combine at random to form the individuals in the next generation. Anyone who has been in a corn field during sexual reproduction has witnessed the random nature of male and female gametes combining. Once the pollen or egg is made, it is simply chance that dictates which gametes will get together. If a large sample of offspring from a given cross is examined, the genetic combinations will reflect the random nature of gametes combining and forming offspring. Fig. 10: Gametes combine at random with respect to the genes that they carry. Comments Be the first to write a comment... Add Comment

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This project was supported in part by the National Research Initiative Competitive Grants CAP project 2011-68002-30029 from the USDA National Institute of Food and Agriculture, adminstered by the University of California-Davis and by the National Science Foundation (NSF), Division of Undergraduate Education, National SMETE Digital Library Program, Award #0938034, administered by the University of Nebraska. Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the USDA or NSF.
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