Punnett Square Review

Practice Punnett squares for genetics and heredity. Master genotype, phenotype, and probability!

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. A monohybridcross looks at only one trait.3. A dihybridcross looks at two traits at a time.4. DNA is a double helix molecule.5. Chromosomes are strands of tightly wound DNA.6. Genes are sections of a chromosome that carry the code for a particular trait.7. DNA contains coded instructions that store and pass on genetic information 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? 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 b Bb bb b Bb bb What are the chances that the parents will have a child with blue eyes? 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 flowers Pp purple flowers pp white flowers 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 Tail spikes are dominant to plain (use "T" and "t") Phenotype Gentotype Pointed (homozygous) TT Pointed (heterozygous) Tt Round tt Pedigree Practice Answer the questions based on pedigrees. Answer the questions left to right.Pedigree #1:How many males are present in this pedigree?How many children are married in this family?How many children does this couple have?Pedigree #2:How many females are present in this pedigree?How many males have the disorder that is affecting them?How many generations are in this pedigree? 5 4 10 4 1 4