Mendelian Genetics Review

Matching Match the term with the correct definition Heterozygous two different alleles, a hybrid (Tt) Heredity The passing of characteristics from parent to offspring Genotype The type of genes or alleles present in an organism Dominant The type of gene that always shows even in the presence of a recessive allele Trait Different forms of the same gene (EX: Tall vs. Short) Homozygous Two alleles of the same form that makes up a genotype, pure breed (TT or tt) Gregor Mendel The father of modern genetics Recessive For of a gene only expressed in a homozygous state (hidden allele) Phenotype An organism's physical appearance Genetics The study of heredity Gene A segment of DNA located on a chromosome that codes for a particular protein Mendelian Genetics - Fill in the blank with the correct term(s) 1. Punnett Squareis a table used to diagram the probability of getting certain genotypes.2. For each trait, we must use the sameletter. The capitalwill represent the dominant allele, and the lowercase will represent the recessive allele.3. To represent each allele, we usually choose the first letterof the dominant trait.4. We inherit two genes for every trait, one from mom and one from dad.5. An alleleis a form of a gene. For all of Mendel's traits in peas, there are two alleles, a dominant form and a recessive form. Punnett Square Practice. In dogs, bristly hair is dominant over silky. Cross a silky haired dog with a heterozygous bristly haired dog. b b B Bb Bb b bb bb What is the percentage that their offspring will be silky? For each genotype, indicate whether it is heterozygous (HE) or homozygous (HO) Genotype HE AA HO Ee HE Hh HE LL HO bb HO Qq HE Phenotype practice - For each of the genotypes, determine the phenotype. Purple flowers are dominant to white flowers. Genotype Phenotype PP purple Pp purple pp white Round seeds are dominant to wrinkled. Genotype Phenotype RR round Rr round rr wrinkled Genotype practice - for each of the phenotypes, list the genotype In dogs, long hair is dominant to short hair. (use "L" and "l") phenotype genotype Long (homozygous) LL Long (heterozygous) Ll Short ll In dinosaurs, it is thought that tail spikes are dominant to plain tails. (us "T" and "t") Phenotype Gentotype Spiked (homozygous) TT Spiked (heterozygous) Tt Plain tt