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In tomatoes, red fruit is dominant to yellow fruit, and purple stems are dominant to green stems. The
genes encoding these traits are on different homologous chromosomes. The progeny from a mating
consisted of 305 red fruit, purple stem plants; 328 red fruit, green stem plants; 110 yellow fruit,
purple stem plants; and 97 yellow fruit, green stem plants.
What would be the genotypic and
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- A white F2 plant is allowed to self-fertilize. Of the progeny, 3/4 are white-flowered, and 1/4 are purple-flowered. What is the genotype of the white F2 plant?Assume that the trihybrid cross AABBrr x aabbRR is made in a plant species. Assume that A and B are dominant alleles, but there is no dominance effect of alleles at the R locus. a) How many different gametes are possible in the F1generation? What are the genotypes of these gametes? b) What is the probability of the parental aabbRR genotype in the F2 progeny? c) What proportion of the F2 progeny would be expected to be homozygous for all three genes?Two genes, m (apical meristem) and r (starburst rhizosomes), are linked on chromosome #5 in pea plants. Both genes are recessive to wild type and found to be 8 MU apart. If a wild type heterozygote is test- crossed, and produces 91 apical meristem plants and 8 apical, starburst plants from a total of 200 plants were produced, how many wild type plants will be produced? 4 8. 12 16
- In barley, a self-fertilizing species that can be cross-fertilized, two true-breeding strains with virescent leaves occur. In strain A, the trait is caused by a cytoplasmic gene while in strain B it is by a recessive chromosomal gene. What phenotypes would you expect among the progeny, and in what proportions in each of the following? Illustrate your crosses below, indicate and the female and male parent for each cross, and write the phenotype of all the parents and offspring(s). a. reciprocal crosses between A and BThe crossing of two orange-flowering plants results in 61 orange-flower progeny and 27 white-flower progeny. The crossing of two orange-flowering F1 plants generates a similar progeny ratio as observed for the parental cross, while the crossing of white-flowering F1 plants only produces white-flowering progeny. What is a likely explanation for these results?In barley, a self-fertilizing species that can be cross-fertilized, two true-breeding strains with virescent leaves occur. In strain A, the trait is caused by a cytoplasmic gene while in strain B it is by a recessive chromosomal gene. What phenotypes would you expect among the progeny, and in what proportions in each of the following? Illustrate your crosses below, indicate and the female and male parent for each cross, and write the phenotype of all the parents and offspring(s). a. reciprocal crosses between A and Bb. crossing of each F1 in (a) to each of the paternal strainsc. self-fertilization of the F1’s in (a)d. reciprocal crosses between F1’s in (a) Use the following gene assignments: Strain A (trait is in Cytoplasm) A – virescent a – not virescent Strain B (recessive chromosomal gene) B – not virescent b - virescent
- Radishes may be round, oval and lomg. Aside from this, they may be red, purple or white in color. Red x white produces progeny, all of which are purple. If purple oval will becrossed with purple oval, how many types of phenotypes will appear and If purple oval are crossed with white, long radishes, then what genotypic and phenotypicratios exist in the progeny? Indicate the phenotypes of the offspring.Thorn apples produce either purple (P) or white (p) flowers, and their fruits are either spiny (S) or smooth (s). These two genes are located on non homologous chromosomes. What is/are the phenotypes and genotypes of the offspring that result from the cross PPss x PpSs? If the cross PpSS x ppSs is made, which of the following is/are not represented in the offspring? PpSS PpSs ppSS ppSs PPSsRadishes may be round, oval and lomg. Aside from this, they may be red, purple or white in color. Red x white produces progeny, all of which are purple. If purple oval will becrossed with purple oval, how many types of phenotypes will appear and If purple oval are crossed with white, long radishes, then what genotypic and phenotypicratios exist in the progeny? Indicate the phenotypes of the offspring. (show the solutions)
- Three fruit shapes are recognized in the summer squash (Cucurbita pepo): disk-shaped, elongated, and sphere shaped. A pure disk-shaped variety was crossed to a pure elongated variety. The F1 were all disk-shaped. Among 80 F2 there were 30 sphere-shaped, 5 elongated, and 45 disk-shaped. Keeping in mind this gene interaction, what phenotypic proportions are expected in the progeny of the sphere-shaped in F2 when crossed at random?In barley, a self-fertilizing species that can be cross-fertilized, two true-breeding strains withvirescent leaves occur. In strain A, the trait is caused by a cytoplasmic gene while in strainB it is by a recessive chromosomal gene. Illustrate the crossing of each F1 in (a) to each of the paternal strains What phenotypes would you expect among theprogeny, and in what proportions in each of the following? Illustrate your crosses below,indicate and the female and male parent for each cross, and write the phenotype of allthe parents and offspring(s).In rice, male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of rice plants (i.e. the stamen) unable to produce fertile pollen; the female parts, however, remain receptive to pollination by pollen from male fertile rice plants. However, the presence of a nuclear fertility restorer gene F restores fertility to male-sterile lines. Give the result(s) of the cross and explain the phenotype of the offspring.