In shorthorn cows, neither the red-haired gene (R) nor the white-haired gene (r) is dominant. A hybrid cow displays a roan color. A pure red cow and crossed with a pure white bull. What are the possible genotypes and phenotypes and their likelihood of appearance? Dam Genotype Sire % chance in offspring Phenotype % chance in offspring
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- More Crosses with Pea Plants: The Principle of Independent Assortment Two traits are examined simultaneously in a cross of two pure-breeding pea-plant varieties. Pod shape can be either swollen or pinched. Pea color can be either green or yellow. A plant with the traits swollen and green is crossed with a plant with the traits pinched and yellow, and a resulting F1 plant is self-crossed. A total of 640 F2 progeny are phenotypically categorized as follows: 360 swollen yellow 120 swollen green 120 pinched yellow 40 pinched green a. What is the phenotypic ratio observed for pod shape? Pea color? b. What is the phenotypic ratio observed for both traits considered together? c. What is the dominance relationship for pod shape? Pea color? d. Deduce the genotypes of the P1 and F1 generations.More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness (R) is dominant to left-handedness (r). a. Parents: brown eyes, right-handed brown eyes, right-handed Offspring: 3/4 brown eyes, right-handed 1/4 blue eyes, right-handed b. Parents: brown eyes, right-handed blue eyes, right-handed Offspring: 6/16 blue eyes, right-handed 2/16 blue eyes, left-handed 6/16 brown eyes, right-handed 2/16 brown eyes, left-handed c. Parents: brown eyes, right-handed blue eyes, left-handed Offspring: 1/4 brown eyes, right-handed 1/4 brown eyes, left-handed 1/4 blue eyes, right-handed 1/4 blue eyes, left-handedPea PlantsIn pea plants, a round-seed shape (R) is dominant over a wrinkled-seed shape (r). A round-seeded pea plant was crossed with another round-seeded pea plant. What are the genotype(s) and phenotype(s) ratios of the F1 generation? Show all possibilities using Punnett squares. State the F1 generation genotypes and phenotypes.
- In cat, a black cat when crossed with a white cat produces a tabby which appears to be a gray cat striped with black and white fur. What is the F1 phenotyphic ratio of a cross between a black and white cats? Numerical anwers only. When tabby cats are crossed with black cat. what is the phenotypic ratio of the offspring? Numerical anwers only. When tabby cats are crossed black cat. What is the phenotypes of the offspring? write in CAPITAL LETTERS WITH SEPARATE COMMAS When tabby cats are crossed with white cat. what is the phenotypic ratio of the offspring? Numerical anwers only. What is the specific mode of inheritance behind this phenomenon?Do a punnet square to find the possible genotypes and phenotypes of the F1 generation when a plant that is homozygous recessive for pod color and heterozygous for pea shape is crossed with a plant that is heterozygous for pod color and homozygous dominant for pea shape. Dominant for pod color = G (green) Recessive for pod color = g (yellow) Dominant for pea shape = R (round) Recessive for pea shape = r (wrinkled) P1: GG X Rr Gg X RRIn radishes, two incompletely dominant genes control color and shape. Red ( R) is dominant over white ( r), and heterozygotes are purple. Long (L) is dominant over round ( 1), and heterozygotes are oval. If a true-breeding long, red radish is crossed with a purple oval radish, give the F1 phenotypes and their percentages. O a. 25% long red, 50% long purple, 25% oval white O b. All long red O c. 25% oval red, 25% oval purple, 50% round purple O d.25% long red, 50% round purple, 25% round white O e. 25% long red, 25% long purple, 25% oval red, 25% oval purple
- . In foxgloves, three different petal phenotypes exist:white with red spots (WR), dark red (DR), and lightred (LR). Two different kinds of true-breeding WRstrains (WR-1 and WR-2) can be distinguished bytwo-generation intercrosses with true-breeding DRand LR strains:F2Parental F1 WR LR DR1 WR-1 × LR all WR 480 39 1192 WR-1 × DR all WR 99 0 323 DR × LR all DR 0 43 1324 WR-2 × LR all WR 193 64 05 WR-2 × DR all WR 286 24 74 a. What can you conclude about the inheritance ofthe petal phenotypes in foxgloves?b. Ascribe genotypes to the four true-breeding parental strains (WR-1, WR-2, DR, and LR).c. A WR plant from the F2 generation of cross 1 isnow crossed with an LR plant. Of 500 total progeny from this cross, there were 253 WR, 124 DR,and 123 LR plants. What are the genotypes of theparents in this WR × LR mating?A wild-type fruit fly (heterozygous for gray body color andred eyes) is mated with a black fruit fly with purple eyes. Theoffspring are wild-type, 721; black purple, 751; gray purple, 49;black red, 45. What is the recombination frequency betweenthese genes for body color and eye color? Using informationfrom problem 3, what fruit flies (genotypes and phenotypes)would you mate to determine the order of the body color, wingsize, and eye color genes on the chromosome?If a homozygous tall pea plant is crossed with a homozygous shortpea plant, what are the possible genotype and phenotype of theoffspring? Legend: T- tall pea plant t- short pea plant Genotypes of the parents: TT x tt Question to answer ff: 1. What is the genotypic ratio? 2. What are the possible phenotypes of the offspring? 3. What is the phenotypic ratio?
- In dogs, coat color maybe black, brown or white. A series of crossings between black and white dogs gave the following F2 results: 28 BLACK:13 WHITE: 9 BROWN. What is the expected F2 phenotypic ratio?In a certain plant, the orange flower allele (Y) is dominant to the yellow flower allele (y). An allele that prevents flower color pigment formation (W) results in white flowers irrespectively of the Y and y alleles, and is dominant to an allele (w) that allows flower color formation. What is the expected proportion of phenotypes in the offspring of a cross between two dihybrid white-flower plants? 1/3 white flowers, 1/3 orange flowers, 1/3 yellow flowers 9/16 white flowers, 3/16 orange flowers, 3/16 yellow flowers, 1/16 orange-yellowish flowers 12/16 white flowers, 3/16 orange flowers, 1/16 yellow flowers 6/8 white flowers, 1/8 orange flowers, 1/8 yellow flowers 1/2 white flowers, 1/4 orange flowers, 1/4 yellow flowers. The genotype r/r ; p/p gives fowl a single comb, R/− ; P/−gives a walnut comb, r/r ; P/− gives a pea comb, andR/− ; p/p gives a rose comb (see the illustrations).Assume independent assortment.Single Walnut Pea Rosea. What comb types will appear in the F1 and in the F2and in what proportions if single-combed birds arecrossed with birds of a true-breeding walnut strain?b. What are the genotypes of the parents in a walnut ×rose mating from which the progeny are 38 rose, 38 walnut,18 pea, and 18 single?c. What are the genotypes of the parents in a walnut ×rose mating from which all the progeny are walnut?d. How many genotypes produce a walnut phenotype?Write them out