Genetics

Master genetics with our Punnett Square worksheet!

Matching Match the term with the correct definition Homozygous the same two alleles present Phenotype The appearance of a trait Recessive The type of gene that can be hidden by the presence of another gene Allele Different forms of the same gene (EX: Tall vs. Short) XX The sex chromosomes of a female XY The sex chromosomes of a male Homozygous Two alleles of the same form that makes up a genotype, pure breed (TT or tt) Gregor Mendel The father of modern genetics Genetics The study of heredity Gene A segment of DNA located on a chromosome that codes for a particular protein GG, Gg Examples of dominant traits gg An example of a recessive trait Mendelian Genetics - Fill in the blank with the correct term(s) 1. A different form of a gene is an allele.2. A Punnett Square is a table used to diagram the probability of getting certain genotypes.3. Probability is the likelihood that something will happen.4. A genetic characteristic is called a trait.5. The genetic makeup of an organism is the genotype.6. A portion of DNA that carries information to make a protein is a gene.7. A monohybrid cross looks at only one trait.8. Inside nuclei are DNA where genetic information is kept.9. The study of how characteristics are transmitted from parents to offspring is genetics. Punnett Square Practice Both parents are tall (dominant allele). T T T TT TT T TT TT From the previous cross, what is the percentage that their offspring will be short? 0% 25% 50% 75% 100% One parent is heterozygous for their brown eyes (dominant) while the other is homozygous for blue (recessive). Complete the cross and find the offspring. B b b Bb bb b Bb bb From the previous cross, what are the chances that the parents will have a child with blue eyes? 0 1 2 3 4 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. Yellow seed color is dominant to green seed color. Genotype Phenotype YY yellow Yy yellow yy green Axial flowers are dominant to terminal flowers. Genotype Phenotype aa terminal AA axial Aa axial Genotype practice - for each of the phenotypes, list the genotype Straight hair is dominant to curly. phenotype genotype Straight (homozygous) SS Straight (heterozygous) Ss Curly ss Tail spikes are dominant to plain (use "T" and "t") Phenotype Gentotype Tail spikes (pure bred) TT Tail spikes (hybrid) Tt no tail spikes tt Which pair of alleles would represent a heterozygous fly?Long wings (L) Short wings (l) LL Ll ll XY XX Which parental genotypes would produce only "LL" offspring?Long wings (L) Short wings (l) Ll x Ll LL x ll Ll x ll LL x LL Which parental genotype would probably produce 75% long and 25% short-winged offspring?Long wings (L) Short wings (l) LL x Ll Ll x Ll ll x Ll LL x ll A puppy has a genotype of Ll for hair length. What is the length of the puppies' hair?Long hair (L) Short hair (l) Long hair Short hair No hair A puppy has a genotype of "ss". Does the puppy have a spotted coat or a solid coat?Spotted (S) Solid (s) Spotted coat Solid coat Use the following terms to label the picture below: DNA, nucleus, gene, cell, chromosome nucleus chromosome gene cell DNA