bio14

Biology, 6th Edition

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Greg Steinberg Mrs. Wierzbowski AP Biology Chapter 14 Mendel and the Gene Idea A. Gregor Mendel’s Discoveries a. Mendel i. Mendel bred peas at his monastery. ii. Mendel noticed that some of the pea plants had certain characters, like purple flowers. The complementary white flowers along with the purple flowers are known as a trait, such as “flower color”. iii. Mendel would cross-breed by removing the stamen of some peas and pollinated the carpel with the stamen of another, mature plant. iv. Mendel tracked traits using “either-or” such as, purple flowers or white flowers. v. Mendel also used true-breeding peas so that when the pea self pollinated, the offspring was the same as the parent. vi. The true-breeding parents are referred to as the P generation. vii. The offspring the P-generation produces is known as the F1 generation, and the F2 generation after that. b. Results i. Mendel crossed a white flower along with a purple flower. The F1 generation had all purple flowers. ii. He allowed the F1 generation to self pollinate to the F2 generation. The results were 3:1 purple to white flowers. iii. The gene for flower color exists in two different locations. The alternate versions of the gene are known as alleles. iv. The purple allele and the white allele are the possible variations possible for flower color. v. An organism inherits 2 alleles, 1 from each parent. vi. If the two alleles are different, then there is a dominant one (such as the purple flower) and the recessive allele 9white flower).
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