CUA 6 Review - Genetics & Meiosis

Match the word to its description. Gene a section of DNA that codes for a protein Allele different versions of gene (A) or (a) Genotype the set of alleles responsible for the genetic trait (Aa) or (AA) or (aa) Phenotype the observable PHysical trait Purebred homozygous (AA) or (aa) Hybrid heterozygous (Aa) Place the genotypes shown in the Punnett square into their correct labels Homozygous Dominant AA FF Heterozygous Bb Ss Homozygous Recessive dd ii Monohybrids Fill in the Punnett square shown. Make sure you do NOT add a SPACE after your letters! H h H HH Hh h Hh hh According to the Punnett square you filled out above, what percent of the offspring are homozygous recessive? 0% 25% 50% 75% Match the inheritance pattern to its description. Complete dominance Only the dominant trait is visible in the phenotype, while the recessive trait remains hidden. Incomplete dominance One allele is not completely dominant over its paired allele, resulting in a blended, intermediate phenotype (i.e. red + white = pink) Co-dominance Both alleles are fully and equally expressed in the phenotype, usually shown as spots or stripes (i.e. roan cattle) Sex-linked Characteristics determined by genes located on sex chromosomes (X or Y) Autosomal Characteristics determined by genes located on the 1-22nd pair of chromosomes Fill in the blood types Punnett square shown. X A O B AB BO O AO OO According to the Punnett square you filled out above, what percent of the offspring will have Type A blood? 0% 25% 50% 75% An individual who is heterozygous for type A blood and an individual who is heterozygous for type B can produce offspring with which of the following phenotypes? O A or B A, B, or O A, B, AB, or O Dihybrids Curly hair (H) is always dominant to straight hair (h). The ability to taste PTC (P) is always dominant to not being able to taste PTC (p).What would be the genotype of a parent with straight hair and who is homozygous for the ability to taste PTC? Make sure to write out the 4 letters for the genotype. A parent has the genotype RRSs.Which of the following gamete combinations are not possible with this parent? Select 2. RS rs Rs rS Fill in the dihybrid Punnett square shown. Make sure you do NOT add a SPACE after your letters! AB Ab aB ab AB AABB AABb AaBB AaBb Ab AABb AAbb AaBb Aabb aB AaBB AaBb aaBB aaBb ab AaBb Aabb aaBb aabb How many out of 16 offspring would be expected to be homozygous recessive for both traits using the Punnett Square shown? 9 1 3 4 What is the phenotypic ratio for the cross shown below? 8:3:3:2 8:8:0:0 9:3:3:1 4:4:4:4 Meiosis Crossing over, an exchange of genetic material, is shown below. This process will... increases the genetic variation reduces the diploid number to the haploid number increases the haploid number to the diploid number reduces the probability of mutations Independent assortment varies which alleles are inherited each time fertilization takes place. This process makes it possible for offspring from the same parents to express different traits. A black rhino has 84 chromosomes in its somatic cells. Each gamete produced should have- 23 chromosomes 42 chromosomes 46 chromosomes 84 chromosomes A tetrad of homologous chromosomes is shown.Which new gene combination(s) could result from crossing over? AaBB AABB AaBb aabb Aabb aaBb