Biology 1001A Lecture Notes - Lecture 10: Pea, Dihybrid Cross, Mendelian Inheritance

• School: Western University
• Department: Biology
• Course: Biology 1001A
• Professor: Beth Mac Dougall Shackleton Tom Haffie

Document Summary

Mendel deduced that the trait that had seemed to disappear i(cid:374) the f1 ge(cid:374)eratio(cid:374) (cid:449)as a(cid:272)tuall(cid:455) prese(cid:374)t (cid:271)ut (cid:449)as (cid:373)asked i(cid:374) so(cid:373)e (cid:449)a(cid:455) (cid:271)(cid:455) the (cid:862)stro(cid:374)ger(cid:863) allele. Me(cid:374)del called the masking effect dominance: me(cid:374)del"s se(cid:272)o(cid:374)d h(cid:455)pothesis stated that if an- individual"s pair of genes consists of different alleles, one allele is dominant over the other, recessive, allele. Thus, the results of me(cid:374)del"s (cid:272)rosses support his three h(cid:455)potheses: The genes that govern genetic characters are present in two copies in individuals. If differe(cid:374)t alleles are prese(cid:374)t i(cid:374) a(cid:374) i(cid:374)di(cid:448)idual"s pair of ge(cid:374)es, o(cid:374)e allele is dominant over the other. The two alleles of a gene segregate and enter gametes singly. For obtaining 4 in rolling a die, the probability is 1 divided by 6. The likelihood of rolling an even number (2 or 4 or 6) is 3/6 = the probabilities of all the possible outcomes, when added together, must equal 1.