Red-flowering snapdragons are homozygous for allele R1. White-flowering snapdragons are homozygous for a different allele (R2). Heterozygous plants (R1R2) bear pink flowers. What phenotypes should appear among first-generation offspring of the crosses listed? What are the expected proportions for each phenotype? a. R1R1 × R1R2 c. R1R2 × R1R2 b. R1R1 × R2R2 d. R1R2 × R2R
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Red-flowering snapdragons are homozygous for allele R1. White-flowering snapdragons are homozygous for a different allele (R2). Heterozygous plants (R1R2) bear pink flowers. What
first-generation offspring of the crosses listed? What are the expected proportions for each phenotype?
a. R1R1 × R1R2 c. R1R2 × R1R2
b. R1R1 × R2R2 d. R1R2 × R2R
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- Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny? a. 8lOroundseeds b. 8lOwrinkledseeds c. 405:395 round seeds:wrinkled seeds d. 610:190 round seeds:wrinkled seedsWhich of the following statements illustrates codominance? Select one: a. Red flowers crossed with white flowers produce pink flowers. b. Individuals who are heterozygous for the sickle cell anemia allele are more resistant to malaria. c. Two parents with blood types A and B can have children with blood type O. d. Grey heterozygous chickens have black and white feathers.Two organisms, AABBCCDDEE and aabbccddee, are mated to produce an F1 that is self-fertilized. If the capital letters represent dominant, independently assorting alleles: (a) how many different genotypes will occur in the F2? 3^5=243(AaBbCcDdEe) (b) what proportion of the F2 genotypes will be recessive for all five loci? (c) would you change your answers (a and/or b) if the initial cross occurred between AAbbCCddee X aaBBccDDEE parents? (d) would you change your answers (a and/or b) if the initial cross occurred between AABBCCDDEE X aabbccddEE parents?
- What does a Punnett square tell you? a.The inheritance pattern for a pair of alleles b.The phenotype probabilities of offspring for a given cross c.The number of offspring who will have a particular genotype for a given cross d.The genotype probabilities of offspring for a given cross 2.What would be the most likely karyotype for somebody described as “hemizygous positive for a Y-linked trait”? a.Y+ Y+ b.X Y+ c.X+ Y+ d.X+ Y- 3.X-linked ichthyosis is an X-linked recessive trait that manifests in part as dry, scaly skin (“ichthy-” = fish or fish like). Suppose a couple are considering having a child together. Parent A is heterozygous for the ichthyosis allele while Parent B is hemizygous negative for the ichthyosis allele. What is the probability their child would be unafflicted with ichthyosis but be a carrier of the ichthyosis-causing allele? a.0% b.25% c.50% d.75% e.100% 4.If somebody has the phenotype of…In rabbits, black hair is due to a dominant allele B and brown hair to its recessive allele b. Short hair (H) is dominant to long hair (h). In a cross between a homozygous black, longhaired rabbit and a brown, homozygous shorthaired one, what would the F1 generation look like? If you did not know the genotype of an F1 rabbit, you could determine its genotype by a test cross in which it is crossed with an animal with which phenotype AND genotype If you carried out this test cross, what phenotypes and in what ratio would you expect? What phenotypes in what ratio would be expected in the F2 generation?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.4
- A tall pea plant with purple flowers (both determined by dominant alleles) is crossed with a short plant with white flowers. there is no linkage of genes. if the tall, purple-flowered plant is heterozygous for both traits, the offspring will be: A 1 purple tall:1 white short B 3 purple tall:1 white short C 9 purple tall:3 purple short:3 white tall:1 white short D 1 purple tall:1 purple short:1 white tall:1 white shortThe petals of the plant Collinsia parviflora are normally blue, giving the species its common name, blue-eyed Mary. Two pure-breeding lines were obtained from color variants found in nature; the first line had pink petals, and the second line had white petals. The following crosses were made between pure lines, with the results shown: Parents F1 F2 blue × white blue 101 blue, 33 white blue × pink blue 192 blue, 63 pink pink × white blue 272 blue, 121 white, 89 pink a. Explain these results genetically. Define the allele symbols that you use, and show the genetic constitution of the parents, the F1, and the F2 in each cross. b. A cross between a certain blue F2 plant and a certain white F2 plant gave progeny of which 3 8 were blue, 1 8 were pink, and 1 2 were white. What must the genotypes of these two F2 plants have been?In rabbits, black hair is due to a dominant allele B and brown hair to its recessive allele b. Short hair (H) is dominant to long hair (h). Show punnet squares In a cross between a homozygous black, longhaired rabbit and a brown, homozygous shorthaired one, what would the F1 generation look like? If you did not know the genotype of an F1 rabbit, you could determine its genotype by a test cross in which it is crossed with an animal with which phenotype AND genotype? If you carried out this test cross (from 2, using the F1 from 1), what phenotypes and in what ratio would you expect? What phenotypes in what ratio would be expected in the F2 generation of the cross in point 1?
- In a parental cross of a ADHL disease trait, where the father is affected and the mother is unaffected, 50% of the offspring will have the disease phenotype and 50% will have the WT phenotype. In an F1 cross between an affected male and an unaffected female, the expected proportions of the Disease Phenotype and the WT phenotype, respectively, are: a. 0.667 and 0.333. b. 0.50 and 0.50. c. 0.333 and 0.667. d. 0.0 and 1.0 e. 0.75 and 0.25.A dihybrid cross is performed between two heterozygous individuals (heterozygous for two traits). The resulting offspring had 62 individuals that were dominant for trait 1 and 2 (D/D), 7 individuals that were R/R, 21 individuals that were R/D, and 25 individuals that were D/R. Using Mendelian inheritance as the null hypothesis, use χ2 analysis to determine if the trait follows Mendelian inheritance. A. How many D/D phenotype offspring are expected? B. How many R/D phenotype offspring are expected? C. How many degrees of freedom are there? D. What is your calculated χ2 value? E. What is the critical value if using a probability of 0.05? F. Does the trait follow Mendelian inheritance?a. A variety of fruit bearing plants with the dominant allele A produces cream-coloured fruit while aa plants produce pink or red fruit. Red fruit is produced if allele B is present, and pink fruit is produced when the genotype is bb. What are the expected F2 phenotypes and proportions from intercrossing the F1 offspring of a cross between two plants with the genotype AAbb and aaBB? b. A certain animal can have brown, red, black or gray fur. Assume that fur colour is controlled by a single gene with multiple alleles in a dominance series where black (B1) > brown (B2) > red (B3) > gray (B4). Give the genotypes of two phenotypically different heterozygotes that when crossed produce offspring with the phenotypic ratio of 1 red : 2 black : 1 brown.