Heredity 5 2 Heredity Determining Inheritance 5 2

Heredity: 5. 2

Heredity: Determining Inheritance 5. 2 1. To study the inheritance of a trait, a ________ experiment is conducted. crossbreeding A typical experiment consists of a series of Breeding hybrids to create crosses mating or ______. something unique Selective Breeding for a bigger or smaller dog

2. When the genotype of an organism contains 2 identical alleles for a trait, it is called a _______ homozygous genotype. v. There are two kinds of _______ homozygous genotypes: dominant (2 dominant alleles) v. LL = Homozygous _________ Homozygous recessive (2 recessive alleles) vll = __________

3. When the genotype of an organism contains 2 different alleles for a trait, it is called a _______ genotype. heterozygous genotype. v. There is only 1 kind of ______ v. Ll = _______ (1 dominant and 1 recessive allele) heterozygous

4. Example of crossbreeding with garden pea flower color Generation _____ P LL Ll Cross-pollinate 2 organisms that are homozygous _______for different forms of flower color. ll Ll Ll Generation _____ F 1 Ll Generation F 2 _____ LL Ll Ll ll Ll All offspring have heterozygous _______ genotypes and ____ purple phenotypes. Ll This generation produces all possible genotype combinations and both phenotypes appear.

Try 2 & 3 on your own. Raise your hand for help! 1. Parents: Offspring: LL X _______ ll ______ Ll Ll Ll _____ Ll _____ 2. Parents: Offspring: Ll ll ______ X _______ _____ 3. Parents: Offspring: Ll Ll ______ X _______ _____

Try 4 on your own. Raise your hand for help! 4. The allele H and h control the inheritance of height in pea plants. If a cross between a short plant and a tall plant produces only offspring that are tall: tall H v. Which is the dominant allele? ______ Letter? _____ h short Letter? _____ v. Which is the recessive allele? ______