10) Two pure-breeding phlox plants were crossed, one with dark-blue flowers and the other with pinlThe Fi generation all had dark-blue flowers. When the F₁ were crossed with each other, the F₂ generaticonsisted of 176 plants: 101 with dark-blue flowers, 33 with light-blue flowers, 30 with red flowers, arpink flowers.10) What progeny types would result from crossing pure-breeding plants with light-blue flowenbreeding plants with red flowers?A) all would be dark blueB) 1 light blue: 1 redC) 9 dark blue: 3 light blue: 3 red: 1 pinkD) all would be red

The F2 generation from the initial cross produced four phenotypes: dark-blue, light-blue, red, and…

Answered: 10) Two pure-breeding phlox plants were…

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 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...

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You perform a cross between a parent with the genotype WWiiNNttEErr and another parent that is wlnnTTeerr. All genes are unlinked except for W and I which are 22 mu apart. You take an F1 from this cross and cross it with an individual that is wwiiNntteerr. a) What is the probability that this final cross yields an offspring that is wwiinntteerr? b) What is the probability that this final cross yields an offspring that is NNT or Nntt. (You can ignore all of the other genes for this question.)
A variety of opium poppy (Papaver somniferum L.) with lacerate leaves was crossed with a variety that has normal leaves. All the F1 had lacerate leaves. Two F1 plants were interbred to produce the F2. Of the F2, 249 had lacerate leaves and 16 had normal leaves. Give genotypes for all the plants in the P, F1, and F2 generations. Explain how lacerate leaves are determined in the opium poppy.
A homozygous strain of plants (P1) has a mean height of 12 cm. A second homozygous strain of the same species (P2) has a mean height of 36 cm. When plants from the two strains are crossed together, the F1 plants have mean height of 24 cm. The F2 generation from the F1 X F1 crosses shows a wide range of heights; the majority are like the F1 plants, but 4 of 1000 are only 12 cm high (shortest), and 4 of 1000 are 36 cm high (tallest). 1. How many gene pairs are involved? a. 2 b. 4 c. 6 d. 8
A homozygous strain of plants (P1) has a mean height of 12 cm. A second homozygous strain of the same species (P2) has a mean height of 36 cm. When plants from the two strains are crossed together, the F1 plants have mean height of 24 cm. The F2 generation from the F1 X F1 crosses shows a wide range of heights; the majority are like the F1 plants, but 4 of 1000 are only 12 cm high (shortest), and 4 of 1000 are 36 cm high (tallest). 2. What is the expected proportion of plants in the F2 that are as tall as the F1 plants? a. 37.5% b. 25% c. 50% d. 27.3%
Nicotiana glutinosa (2 n = 24) and N. tabacum (2 n = 48) are two closely related plants that can be intercrossed, but the F1 hybrid plants that result are usually sterile. In 1925, Roy Clausen and Thomas Goodspeed crossed N. glutinosa and N. tabacum and obtained one fertile F1 plant . They were able to self-pollinate the flowers of this plant to produce an F2 generation. Surprisingly, the F2 plants were fully fertile and produced viable seeds. When Clausen and Goodspeed examined the chromosomes of the F2 plants, they observed 36 pairs of chromosomes in metaphase I and 36 individual chromosomes in metaphase II. Explain the origin of the F2 plants obtained by Clausen and Goodspeed and the numbers of chromosomes observed.
+ ec +/Y + + w/Y y ec +/Y + ec +/y ec w ++ w/y ec w у ес +у ес и Determine the order in which the three loci y, ec, and w Occur on the chromosome and prepare a linkage map. 7.22 A cross involving X-linked genes was made between yellow, bar, vermilion female fies and wild males, and the F1 females were crossed with y B v males. The following phenotypes were obtained when 1000 progeny were exam- ined: Dra ord ma the 7.2 546 244 160 50 + + + + Bv y Bv y+ + y+v y B+ and an and and and +B + re + + v ge Determine the order in which the three loci occur on the chromosome and prepare a linkage map. 7.23 Female Drosophila heterozygous for ebony (e"le), scarlet (st*/st), and spineless (ss*/ss) were testcrossed, and the following progeny were obtained: PROGENCY PHENOTYPES NUMBER ir Wild type Ebony Ebony, scarlet Ebony, spineless Ebony, scarlet, spineless Scarlet 67 8. 68 347 78 368 Scarlet, spineless Spineless (a) Are these genes linked? Justify your answer. (b) Write the genes given on a…
Renner carried out reciprocal crosses between two types of the evening primrose, Oenothera hookeri and O. muricata, known to have the same chromosome constitution. When the seed parent was O. hookeri, the plastids of the progeny were yellow; but when the seed parent was O. muricata, the plastids of the progeny were green. How might this difference in the results of reciprocal crosses be explained?
In a cross between a black and a white cat, all members of the Fi generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white cat. (i) Diagram this cross, showing the genotypes and phenotypes of the parents, F, and F2 generations. What is the probability that the first two offspring will be homozygous and the third is white if an Ficat is test crossed?
The genes of tall vine, D, and yellow seed, G, are dominant over their respective alleles for dwarf, d, and green, g. What pheno types and genotypes are expected from each of the following crosses? Include phenotypic and genotypic ratio. a) heterozygoes tall, homozygoes yellow x homozygoes tall, heterozygoes yellow b) dwarf, heterozygoes yellow x heterozygoes tall, green c) homozygoes tall, homozygoes yellow x heterozygoes tall, green d) heterozygoes tall, heterozygoes yellow x heterozygoes tall, heterozygoes yellow
In snapdragons, red flower color (R) is incompletely dominant over white flower color (r). The hybrids or heterozygous plants (Rr) are pink in color. a) Show the genotype for a white flower and for a red flower. b) If a red-flowered plant is crossed with a white-flowered plant, what are the genotypes and phenotypes of the F1 generation plants? c) What genotypes and phenotypes will be produced in the F2 generation? d) How did the genotypic and phenotypic ratio compare to each other in this incomplete dominance cross? e) What would the phenotypic ratio have been if this had been complete dominance? f) What kind of offspring can be produced if a red-flowered plant is crossed with a pink-flowered plant? g) What kind of offspring is/are produced if a pink-flowered plant is crossed with a white-flowered plant?
Two heterozygous parents are crossed. If the two loci are linked whatwould be the distribution of phenotypic features in F1 generation for adibybrid cross?
Two genes in tomatoes are 61 mu apart; normal fruit (F) isdominant to fasciated fruit (f ), and normal number of leaves(Lf ) is dominant to leafy (lf ). A true-breeding plant with anormal number of leaves and fruit was crossed to a leafy plantwith fasciated fruit. The F1 offspring were then crossed to leafyplants with fasciated fruit. If this cross produced 600 offspring,what are the expected numbers of plants in each of the fourpossible categories: normal leaf number, normal fruit; normalleaf number, fasciated fruit; leafy, normal fruit; and leafy,fasciated fruit?

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