BIO 3102 : microevo.doc
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Includes all the individuals of a single species that live together in the same place and time. The sum of all alleles at all gene loci in all individuals is called the populations gene pool. Genotype frequencies: ratio of individuals possessing each genotype, each diploid organism has 2 alleles for each trait, relative abundance of different alleles in a population (has to follow hw principles if want to. 20th century huxley combined mendelian genetics and population genetic. Must look at a large population in order to see evolution. Allele frequencies (traits) where variation is occurring. Evolutionary changes that result from changes in allele frequencies in a population, or in chromosome structure or numbers due to mutation and recombination. Looking at actual source of variation and change within a population of a single species. The hardy weinberg principle is a null model because it predicts what they would see if a particular factor had no effect.
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These all relate to exceptions to the inheritance patterns encountered by Mendel.Ć¢ĀĀ
Why do multiple and lethal alleles often result in modifications of the classic Mendelian monohybrid and dihybrid ratios?
Select the four correct statements.
-When an essential gene is mutated, it can result in a lethal phenotype. There are no classic Mendelian monohybrid and dihybrid ratios. |
-In the case of codominance, heterozygotes produce gene products from both alleles of a gene. Classic Mendelian monohybrid and dihybrid ratios are modified by codominance. |
-In the case of incomplete dominance, the phenotype of the heterozygote is distinct from and often intermediate to the phenotypes of homozygous individuals. Classic Mendelian monohybrid and dihybrid ratios are modified by incomplete dominance. |
-Genes exist in a large number of allelic versions and a diploid organism has two homologous gene loci that may be occupied by different alleles of the same gene. This can result in many different phenotypes for traits, which may not follow typical Mendelian ratios. |
-When an essential gene is mutated, it can result in a lethal phenotype. This results in a modification of classic Mendelian ratios. |
-The phenotype of the heterozygous genotype is distinct from and often intermediate to the phenotypes of the homozygous genotypes. The joint expression of both alleles in a heterozygote is called codominance. There are no classic Mendelian monohybrid and dihybrid ratios. |
-Genes exist in a large number of allelic versions, but in a diploid organism, only one allele of the gene can occupy one homologous gene loci. Classic Mendelian inheritance cannot explain this phenomenon. |
-Each gene produces a unique gene product. The effect of one allele in a heterozygote completely masks the effect of the other. Classic Mendelian genetics cannot explain this phenomenon. |