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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 and 1000 plants are counted, approximately how many plants will have white 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?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 and 1000 plants are coiunted, approximately how many plants will have white flowers?In unicorns that normally have white manes, a recessive allele that is responsible for a pink mane (w) is linked to another recessive allele (l) which causes a short horn. In a test cross of white-maned unicorns with long horns the following phenotypes were observed: White mane; long horn 467 White mane; short horn 33 Pink mane; long horn 27 Pink mane; short horn 473 Total 1000 Calculate the chi-square value χ2. Your “null hypothesis” is that the genes are not linked.
- 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 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 1/64A 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 plants
- If a cross is made between two plants that are heterozygous for two traits (AaBb), then their offspring should follow the 9:3:3:1 ratio. In this case, A is the dominant allele for purple leaves, and B is the dominant allelle for curly roots. If the two parents were crossed to yield 320 progeny, approximately how many plants with purple leaves and curly roots would you expect? Group of answer choices a. 180 b.225 c.25 d.50In corn plants, a dominant allele Z inhibits kernel color, while the recessive allele z permits color when homozygous. At a different locus, the dominant allele X causes purple kernel color, while the homozygous recessive genotype causes red kernel color. If corn plants heterozygous for both the Z and X genes are crossed, what are the chances that the offspring will have purple kernels? Enter your answer as a decimal fraction in the box (e.g. 0.25).Mendel crossed pea plants that produced round seeds with those that produced wrinkled seeds and self-fertilized the progeny. In the F2, he observed 5474 round seeds and 1850 wrinkled seeds. Using the letters W and w for the seed texture alleles, diagram Mendel's crosses, showing the genotypes of the plants in each generation. Are the results consistent with the Principle of Segregation?
- If a cross is made between two plants that are heterozygous for two traits (AaBb), then their offspring should follow the 9:3:3:1 ratio. In this case, A is the dominant allele for purple leaves, and B is the dominant allelle for curly roots. If the two parents were crossed to yield 320 progeny, approximately how many plants with purple leaves and curly roots would you expect? Group of answer choices a.180 b.225 c.25 d.50 As part of a lab experiment, you create a two-locus cross between two plants, and you expect to see a 8:4:2:2 ratio of offspring. You determine the phenotype for 160 offspring, and find the proportions 84:38:19:19. If you use a chi-square test to determine whether the offspring do indeed fit this pattern, how many degrees of freedom would the test have? Group of answer choices a.2 b.3 c.83 d.4Dominant 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.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.