01:119:115 Lecture 14: chapter14

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:115
• Professor: A Keating

Document Summary

Chapter 14 - mendel and the gene idea. It (cid:449)as (cid:373)ai(cid:374)l(cid:455) me(cid:374)del"s (cid:395)ua(cid:374)titati(cid:448)e a(cid:374)al(cid:455)sis of f(cid:1006) pla(cid:374)ts that (cid:396)e(cid:448)ealed t(cid:449)o fu(cid:374)da(cid:373)e(cid:374)tal principles of heredity: the law of segregation and the law of independent assortment. By the law of segregation, the two alleles for a character are separated during the formation of gametes. If the blending model was correct, the f1 hybrids from a cross between purple-flowered and white-flowered pea plants would have pale purple flowers. For example, when mendel crossed two true-breeding varieties, one producing round seeds and the other producing wrinkled seeds, all the f1 offspring had round seeds. In the f2 plants, 75% of the seeds were round and 25% were wrinkled: mendel developed a hypothesis to explain these results that consisted of four related ideas. We will explain each idea with the modern understanding of genes and chromosomes. If the t(cid:449)o alleles at a lo(cid:272)us diffe(cid:396), the(cid:374) o(cid:374)e, the do(cid:373)i(cid:374)a(cid:374)t allele, dete(cid:396)(cid:373)i(cid:374)es the o(cid:396)ga(cid:374)is(cid:373)"s appearance.