Basic Mendelian Genetics Review

Matching - Part 1 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) Matching - Part 2 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 Punnett Square Practice Both parents are tall (dominant allele). Punnett T T T TT TT T TT TT What is the percentage that their offspring will be short? 0% 25% 50% 100% One parent is heterozygous for their brown eyes while the other is homozygous for blue. Complete the cross and find the offspring. Punnett B b bb Bb bb bb Bb bb What are the chances that the parents will have a child with blue eyes? 0% 50% 75% 100% 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 Straight hair is dominant to curly. (use "R" and "r") phenotype genotype Straight (homozygous) RR Straight (heterozygous) Rr Curly rr