Genetics Unit Review (With Dihybrids)

Monohybrids Punnett Squares Video Watch the video (if needed) to help answer the questions below. Genetics Vocabulary Matching Genotype A representation of the alleles a person has using letters. Phenotype A physical description of a version of a trait. Homozygous When both alleles are the same (AA or aa). Heterozygous When the two alleles for a trait are different (Aa). Dominant The version of the trait that is expressed over another version. Represented by a capital letter. Recessive The version of the trait that is hidden by another version. Represented by a lowercase letter. Allele A version of a genetic trait. Represented by a single letter. Punnett Square Having freckles is dominant (F)to not having freckles (f). Fill in the Punnett Square below to show a cross between two parents that are both heterozygous for having freckles. F f F f FF Ff Ff ff In the cross above, what percentage of offspring would be expected to have freckles? 0% 25% 50% 75% 100% In the cross above, what percentage of offspring would be expected to be homozygous dominant? 0% 25% 50% 75% 100% In pea plants, tallness is dominant over shortness. If 50% of one generation of pea plants is short, what were the probable genotypes of the parents? Tt x Tt TT x tt tt x tt Tt x tt Sort the descriptions into either Homozygous or Heterozygous categories. Homozygous Purebred Can be Dominant or Recessive BB dd Heterozygous Hybrid Carrier Always Dominant Tt The gene for tallness is dominant over the gene for shortness in pea plants. A homozygous dominant pea plant is crossed with a heterozygous pea plant, and 200 seeds are produced. Approximately how many of these seeds can be expected to produce plants that are homozygous dominant? 0 50 100 200 Non-Mendelian Genetics Video Watch this video (if needed) to help answer the questions below. Codominance Third Phenotype = "Both Show" Incomplete Dominance Third Phenotype = "Blend" Polygenic A range of many phenotypes are possible Multiple Alleles Blood Types Watch the video (if needed) to help answer the questions below. Which blood type is known as the "universal donor"? A B AB O Which blood type is known as the "universal recipient"? A B AB O A person with type A blood could receive blood from which of the following types? (Select all that apply) A B AB O A person with type AB blood has a child with a person with type O blood. Which blood types could their child have? (Select all that apply) A B AB O Sex-Linked Traits Watch the video (if needed) to help answer the questions below. What chromosome carries most sex-linked traits? X Y Who is more likely to be affected by sex-linked traits (such as colorblindness, hemophilia, etc.)? Females Males Sex-Linked Punnett Square In the Punnett Square above, what is the probability of having a boy with the recessive trait? 0% 25% 50% 75% 100% Who can be "carriers" of sex-linked traits? Males Females Watch this video (if needed) to help answer the questions below. Dihybrid Punnett Square Fill in the blank boxes on the Punnett Square below. RrYy RrYy rrYY rrYy RrYy Rryy rrYy rryy What is the chance of the cross above producing Round and Yellow peas? 9 3 1 What is the chance of the cross above producing Round and Green peas? 9 3 1 What is the chance of the cross above producing Pinched(wrinkled) and Yellow peas? 9 3 1 What is the chance of the cross above producing Pinched(wrinkled) and Green peas? 9 3 1 Which of the following gametes could a heterozygous round (dominant) and green (recessive) pea plant produce? (Select all that apply - *remember FOIL) RY Ry rY ry