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- type P = n! (p)* (q)"* х! (n - х)! Practice Problem: You cross a true-breeding pea plant with red flowers to a true-breeding pea plant with white flowers. All of your offspring have red flowers. Which gene is dominant? Why? What is the genotype of your offspring? You then cross the offspring to each other. What ratio do you expect? Why? You count 1000 plants and look at their flowers. Your results are as follows: 740 red 260 white Does this follow a simple Mendelian inheritance pattern? Why or why not? DADT 2 MEA SUDI ND D LUT IONSIn dogs, dark coat color phenotype (D) is dominant over albino (a) and short hair (S) is dominant over long hair (I). Assume that these phenotypes are caused by two independently assorting genes and write as much as you can, the genotypes of the parents in the cross below. D, a, S and I represent phenotypes Y indicates the presence of progeny with this phenotype, whereas N indicates the absence of progeny with this phenotype PARENTS PHENOTYPES TYPES of PROGENY PHENOTYPE D,S D,I a,S a,l D,S X a,l Y Y NIn dogs, dark coat color phenotype (D) is dominant over albino (a) and short hair (S) is dominant over long hair (1). Assume that these phenotypes are caused by two independently assorting genes and write as much as you can, the genotypes of the parents in the cross below. D, a, S and I represent phenotypes Y indicates the presence of progeny with this phenotype , whereas N indicates the absence of progeny with this phenotype PARENTS PHENOTYPES TYPES of PROGENY PHENOTYPE D,S D,I a,S a,l D,S X a,l Y Y
- Kernel color in wheat is controlled by 2 pairs of genes (AABB). Determine the color of each offspring with the following genotypes: (Note: 4 alleles – red; 3 – medium red; 2 – intermediate red; 1 – light red; 0 – white). CAPITAL letters only and with spaces when applicable. AABb - AaBb - AABB - aaBb - aabb -A heterozygous tall pea plant is crossed with a short pea plant. What are the expected genotypic and phenotypic ratios for this cross? ( you should write the genotype and phenotype for the generation)In tomatoes, red fruit color (R) is dominant over yellow fruit color (r). Do the following crosses: Rr x rr Rr x RR rr x RR Rr x Rr rr x Rr rr x rr Show your Punnett square for each cross. For each cross also show the genotypic and phenotypic ratios.
- Consider the following dihybrid testcross: B/b • E/e × b/b • e/e For the progeny from this testcross, determine the relative proportions (from 0% to 100%) of each genotype if the two genes: a) are linked (dominant alleles in cis conformation) with no crossing over: Be/be: be/be: BE/be: bE/be: b) assort independently. B/b; E/e: B/b; e/e: b/b; E/e: b/b; e/e: c) are linked (dominant alleles in cis conformation) and 20 map units apart. Be/be: be/be: BE/be: bE/be:Male cats are either black (B) or orange (O). Females are black, orange, or calico, which has patches of black and orange. Calico is formed from the codominance between the two alleles in the heterozygote, so a calico cat is (XB XO). Give the genotype and phenotype ratio of a cross between an orange male cat and a calico cat.A yellow female is crossed with a gray male. The F1 are intercrossed to produce the F2. Give the genotypes and phenotypes, along with the expected proportions, of the F1 and F2 progeny.
- From a cross (Xyz) / (xYZ) x (xyz) / (xyz), where X,x, Y,y and Z,z represent alleles of three linked genes whose relative order is unknown, the least frequent classes of progeny are genotype (xyz) / (xyz) and (XYZ) / (xyz). What is the correct relative order of genes X, Y and Z? Answer using lowercase letters separated by a dash (-). Example: x-y-zWhat are the expected phenotypic ratios from the following cross:Tt Rr yy Aa × Tt rr YY Aa, where T = tall, t = dwarf, R = round,r = wrinkled, Y = yellow, y = green, A = axial, a = terminal; T, R,Y, and A are dominant alleles. Note: Consider using the multiplication method in answering this problemAn individual with the genotype F/f • G/g • H/h is testcrossed. Among the progeny, the proportions of genotypes from this cross are shown in the following table: a) What gene is in the middle? Type you answer in this box: b) Calculate the genetic distances (in centimorgans, cM) between: genes g and f: genes f and h: genes g and h: c) What are the genotypes of the two parents? d) Calculate the interference and type your answer here: