Genetics and Evolution-The Nature of variation 2.0 / 5 based on 1 rating ? BiologyUniversityOther Created by: jessicaCreated on: 06-02-13 14:20 How are discontinuous traits determined? By single genes-the alleles are at a single locus. 1 of 9 What are the three ways that phenotypes are expressed in complex gene traits? continuous, meristic, threshold 2 of 9 How are continuos traits shown in the phenotypes? All phenotypes from one extreme to another e.g. height, weight, yield 3 of 9 How are meristic traits shown in the phenotypes? Phenotype only expressed in whole units. 4 of 9 How are threshold traits shown in the phenotypes? Individuals have underlying predisposition for trait, If predisposition reaches threshold the phenotype is displayed. 5 of 9 What variations are at chromosomal level? Polymorphism for chromosome number and morphology, includes extra chromosomes, reciprocal translocations and inversions. 6 of 9 How are variants maintained in populations? They give rise to fitness modifications and are selected in different environments. 7 of 9 How can polymorphisms lead to population sub-structuring and speciation? Different inversions are selected in different environments and this maintains the polymorphism. 8 of 9 What do inversion shapes do? Prevent the important genes from being damaged, so they form the loops, getting translated/copied together, avoiding changes in these genes. 9 of 9
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