A red-flower plant crossed with a white-flower plant of the same species, produced F1 with all pink flowers. Self-pollination of the F1 plant produced F2 generation with 39 red-flower plants, 83 pink-flower plants and 40 white-flower plants. What does this experiment demonstrate? * Codominance Incomplete dominance Polygenic inheritance Multiple alleles

A red-flower plant crossed with a white-flower plant of the same species, produced F1 with all pink flowers. Self-pollination of the F1 plant produced F2 generation with 39 red-flower plants, 83 pink-flower plants and 40 white-flower plants. What does this experiment demonstrate? * Codominance Incomplete dominance Polygenic inheritance Multiple alleles

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 1ACQ: Figure 8.9 In pea plants, round peas (R) are dominant to wrinkled peas (r). You do a test cross...

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F1 hybrids between two species of cotton, Gossypium barbadenseand Gossypium hirsutum, are very vigorous plants. However, F1crosses produce many seeds that do not germinate and a high percentageof very weak F2 offspring. Suggest two reasons for theseobservations.
Independent assortment predicts a 9:3:3:1 ratio in a dihybrid cross, with four different phenotypes in the F2 progeny. If there were epistasis between the two loci, what would you predict? O more than four phenotypes O fewer than four phenotypes O no change in the 9:3:3:1 ratio O an excess of parental phenotypes O heterozygotes with an intermediate phenotype
Given two strains of autotetraploid plants AAaa – in this plant the gene is close to the centromere Aaaa – in this plant the gene is far from the centromere provide the gametes of the two plants, and the genotypic and phenotypic ratios of the offspring when crossed
n corn, male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of the corn plants (i.e the tassel) unable to produce fertile pollen; the female parts, however, remain receptive to pollination by pollen from male fertile corn plants. However, the presence of a nuclear fertility restorer gene F restores fertility to male sterile lines sing the cardboard chips, simulate the crosses indicated below. Give the genotypes and phenotypes of the offsprings in each cross, and properly label the nucleus and the cytoplasm of each individual in the cross Legend male sterile cytoplasm Male fertile cytoplasm FF nucleus Ff nucleus ff nucleus A. Male sterile female x FF male Explain the phenotype of the offspring B. Male sterile female x Ff male Explain the phenotype of the offspring
In maize trisomics, n + 1 pollen is not viable. If adominant allele at the B locus produces purple colorinstead of the recessive phenotype bronze and a B b btrisomic plant is pollinated by a B B b plant, whatproportion of the progeny produced will be trisomicand have a bronze phenotype?
. Chromosome 3 of corn carries three loci (b for plant-color booster, v for virescent, and lg for liguleless). A testcross of triple recessives with F1 plants heterozygous forthe three genes yields progeny having the followinggenotypes: 305 + v lg, 275 b + +, 128 b + lg, 112 + v +,74 + + lg, 66 b v +, 22 + + +, and 18 b v lg. Give the genesequence on the chromosome, the map distances between genes, and the coefficient of coincidence.
Incomplete dominanceIn Mendel's experiments, if the gene for tall (T) plants was incompletely dominant overthe gene for short (t) plants, what would be the result of crossing two Tt plants? Explain result.
AKS 7b/7e Mendelian Inheritance In pea plants the allele for round seeds (R) is dominant to the allele for oval seeds (r). In a cross between the two heterozygous plants what percentage of the offspring will have round seeds? * O 75% O 50% O 25% O 100% This is a required question In pigeons, the allele for normal feathers (F) is dominant to the allele for frizzy feathers (f). If a purebred, normal feathered bird (FF) is crossed with a frizzy
n corn, male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of the corn plants (i.e the tassel) unable to produce fertile pollen; the female parts, however, remain receptive to pollination by pollen from male fertile corn plants. However, the presence of a nuclear fertility restorer gene F restores fertility to male sterile lines Using the cardboard chips, simulate the crosses indicated below. Give the genotypes and phenotypes of the offsprings in each cross, and properly label the nucleus and the cytoplasm each individual in the cross Legend male sterile cytoplasm Male fertile cytoplasm FF nucleus Ff nucleus ff nucleus A. Male sterile female x FF male Explain the phenotype of the offspring B. Male sterile female x Ff male Explain the phenotype of the offspring
SET 2: In corn, the following allelic pairs have been identified in chromosome 3: +/b plant color booster vs. non-booster +/lg with ligule vs. without ligule +/v green plant vs. virescent A test cross between triple recessive plants and plants heterozygous for the three pairs gave the following progeny: + v lg b + lg b v lg + + lg 305 148 58 bv + + + + 62 + v + b + + 152 275 1000 Total Calculate the parental and recombinant frequencies, the map distances between genes, and the coefficient of coincidence. Illustrate the gene map or sequence.
To determine the recombination frequency of two linked genes, what genotypes of organisms are crossed? O Amy cross between two individuals will yield the same results O A homarygous dominant individual with a homozvgos recesshve O A heterozygous individual with a homozypous dominant individual O A heterozygous individual with a homozygous recessive individual O Two heterorygous individuals
In fruit flies, red eyes (pr+_) are dominant to purple eyes (prpr) and normal wings (vg+_) are dominant to vestigial wings (vgvg). The genes are located on the same chromosome. A pure breeding red-eyed fly with vestigial wings was crossed with a pure-breeding purple-eyed fly with normal wings. All of the F1 progeny had a WT phenotype. •What isthe arrangement of alleles on the F1's chromosome? •The recombination frequency between the two genes is 15%. If an F1 individual were test crossed, what percentage of the progeny would you expect to have the WT phenotype?