Heredity: 5.2

Heredity: Determining Inheritance 5.2 To study the inheritance of a trait, a _______________ experiment is conducted. A typical experiment consists of a series of mating or ___________. crossbreeding crosses Breeding hybrids to create something unique Selective Breeding for a bigger or smaller dog

When the genotype of an organism contains 2 identical alleles for a trait, it is called a _____________ genotype. There are two kinds of ______________ genotypes: LL = __________________ (2 dominant alleles) ll = ____________________ (2 recessive alleles) homozygous homozygous Homozygous dominant Homozygous recessive

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

4. Example of crossbreeding with garden pea flower color Generation _____ Cross-pollinate 2 organisms that are _____________for different forms of flower color. LL ll homozygous P Ll Ll Ll Ll All offspring have _____________ genotypes and ________ phenotypes. heterozygous F1 Ll purple Ll LL Ll Ll ll This generation produces all possible genotype combinations and both phenotypes appear. F2 LL Ll Ll ll

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

Try 4 on your own. Raise your hand for help! 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: Which is the dominant allele? ______ Letter? _____ Which is the recessive allele? ______ Letter? _____ tall H short h