In a population of pea plants, there are two variations for flower colors-- purple and white. The allele for purple is dominant, but the white allele is recessive. If a test-cross is performed, What percentage will yield purple flowers?
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In a population of pea plants, there are two variations for flower colors-- purple and white. The allele for purple is dominant, but the white allele is recessive.
If a test-cross is performed, What percentage will yield purple flowers?
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- In corn plants, a dominant allele (K) allows kernel colour and a recessive allele (k) inhibits kernel colour when homozygous. On a different chromosome, the dominant gene P causes purple kernel colour and the homozygous recessive genotype causes red kernel colour.A true breeding white corn plant was crossed with a purple corn plant, yielding 50% red corn plants and 50% purple corn plants.What are the genotypes of the parental corn plants? Select one: a. KKPp kkpp b. KkPP kkPP c. kkPp KkPp d. KKPP kkPpTwo true breeding pea plants-one with yellow round seeds (YYRR) and the other with green wrinkled seeds (yyrr)-were crossed. The F1 plants will be dihybrid heterozygous for both the characters (yyRr). The plants were self-pollinated. Will the Y and R alleles always stay together, generation after generation? Or are seed color and seed shape inherited independently of each other? Show how you come to a conclusion.Two pure-breeding lines of petunia plants are crossed. Line 1 plants grow to a height of 54 cm, and Line 2 plants grow to a height of 18 cm. Petunia plant height is controlled by three genes, A, B and C. Line 1 has the genotype A₁A₁B₁B₁C₁C₁, and line 2 has the genotype A2A2B₂B₂C₂C₂. Assume that genotype alone determines plant height under ideal growth conditions and that the alleles of the three genes are additive. If the F1 plants are self crossed, what is the expected proportion of F2 plants with the genotype A₁A₁B₁B₁C₁C₁ 1/8 1/32 1/16 1/4 1/64
- Dominant allele R in corn results in purple kernel, while recessive allele r results in pearl white kernel in homozygous condition. The plant body colour is controlled by another gene with two alternative alleles, G for green colour and g for yellow colour. In a testcross between a corn plant with unknown genotype and a plant that is homozygous recessive for both genes, the following progeny were obtained: Phenotype Purple, green Purple, yellow Pearl white, green Pearl white, yellow Number 90 12 10 88 Explain how these results were obtained by determining the exact genotype of the unknown plant. Include the precise gene arrangement on the homologous chromosomes.A tall pea plant (homozygous dominant) is crossed to a pea plant that is heterozygous for the gene for height. Create a Punnett Square and use it to answer the following questions: What is the genotypic ratio of the offspring? What is the phenotypic ratio of the offspring? Answers are written as genotype; phenotype a) 50% TT : 50% Tt; 100% tall plants b) 1 TT : 2 Tt : 1tt; 75% tall plants : 25% dwarf plants c) 1 TT : 2 Tt : 1tt; 25% tall plants : 50% medium height plants : 25% dwarf plantsIn corn plants, two pairs of genes control color in the ears of corn. The following genotypes result in various colors: W-C- [red]; wwC- [yellow]; W-cc [white]; wwcc [white]. What is the phenotypic ratio of the dihybrid cross between corn plants heterozygous for both genes? (Dashes mean the allele could be W or w, i.e., WWCC/WwCC/WWCc/WwCc geneotype gives red color)
- In the pearl-millet plant, color is determined by three alleles at a single locus: Rp1 (red), Rp2 (purple), and rp (green). Red is dominant over purple and green, and purple is dominant over green (Rp1 > Rp2 > rp). Give the expected phenotypes and ratios of offspring produced by the following crosses. a. Rp1/ Rp2 × Rp1/ rp b. Rp1/ rp × Rp2/ rp c. Rp1/ Rp2 × Rp1/ Rp2 d. Rp2/ rp × rp/ rp e. rp/ rp × Rp1/ Rp2In oats, the color of the chaff is determined by a two-gene interaction. When a true-breeding black chaff plant was crossed to a truebreeding white chaff plant, the F1 generation was composed of allblack chaff plants. When the F1 offspring were crossed to eachother, the ratio produced was 12 black to 3 gray to 1 white. First,construct a Punnett square that accounts for this pattern of inheritance. Which genotypes produce the gray chaff phenotype? Second,at the level of protein function, how would you explain this type ofinheritance?Colored aleurone in the kernels of corn is due to the dominant allele R. The recessive allele r, when homozygous, produces colorless aleurone. The plant color (not the kernel color) is controlled by another gene with two alleles, Y and y. The dominant Y allele results in green color, whereas the homozygous presence of the recessive y allele causes the plant to appear yellow. In a testcross between a plant of unknown genotype and phenotype and a plant that is homozygous recessive for both traits, the following progeny were obtained: colored, green 88 colored, yellow 12 colorless, green 8 colorless, yellow 92 Explain how these results were obtained by determining the exact genotype and phenotype of the unknown plant, including the precise arrangement of the alleles on the homologs.
- You are working for a parakeet breeder that has some green birds and some blue birds. You want to determine which feather color is dominant. You cross a blue male to each of two green females. In the first cross, the blue male is crossed to a green female named Gabby, resulting in 2 green and 2 blue offspring. In the second cross, the same blue male is crossed to a green female named Gail, resulting in 5 green offspring. Based on these results: ● [Select] phenotype is dominant. • Gail's genotype is [Select] The cross between the male and Gabby is called a [ Select] cross.In corn, two independent, recessive nuclear genes, japonica (j) and iojap (ij), produce variegation (green and white striped leaves). Matings between individuals heterozygous for japonica always produce 3 green:1 striped individuals regardless of how the cross is performed. You have a variegated plant that could be either jj or ijij . What cross can you make to determine the genotype of this plant, and what results do you expect in the F1 generation in each case?In roses, red petals (r) and waxy texture (wx) are encoded by two mutant alleles that are recessive to those that produce wild-type traits; yellow petals (r+) and soft texture (wx+). A rose homozygous for red petals and waxy texture is crossed to a rose homozygous for the wild-type traits. The F1 have yellow petals and soft texture. The F1 are crossed with roses that have red petals and waxy texture in a testcross. The progeny of this testcross are (1000 total): Yellow petals, soft texture 300 Yellow petals, waxy texture 126 Red petals, soft texture 110 Red petals, waxy texture 464 What is the genetic distance between red petals and waxy texture? a.57.4 b.76.4 c.23.6 d.30.9 e.42.6