BIS 101 Chapter Notes - Chapter 4: Mendelian Inheritance, Pea, Reciprocal Cross
13 Nov 2016
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Mendel studied garden pea because available in many sizes and shapes, also can be self or cross pollinated. Character synonym for characteristic or trait; means specific property of an organism. Pure line population that breeds true for particular characteristic being studied (all identical: when mendel bred many times ensuring true breeding, he set up a baseline for future studies. Purple flower true bred when selfed they grew into purple plants: white only grew white. Phenotypes contrasting differences between 2 lines of organisms in one particular character; character forms/variations. Parent generation purple x white flower. F1 generation 1st generation of offspring. Reciprocal cross cross can be made either way (male purple or female purple, makes no difference: f1 generation will still have same mix. Allele different forms of a gene. Mendel"s first law principle of segregation members of gene pairs segregate equally into gametes (eggs + sperm) Recessive phenotype not expressed in heterozygote. Homozygote (pure line) a/a (dominant); a/a (recessive)
