Nicotiana tabacum is presumed to be an allotetraploid originating from a cross between N. sylvestris(the S genome) and N. tomentosa (the T genome). Each of the two parental species (2n = 24)contributed 12 chromosomes (S & T), which then doubled to form the 24 pairs of chromosomesobserved in N. tabacum.a) Diagram the entire cross starting with the original parents until the formation of N. tabacum.Distinguish between chromosomes of N. sylvestris and N. tomentosa and give the chromosomenumber of all individuals in the cross. Include gametes in your crosses.b) A monosomic N. tabacum is crossed with N. sylvestris and produces offspring, some with 36chromosomes and some with 35 chromosomes. Using cytological examination at meiosis, the35-chromosome types show 11 bivalents and 13 univalents. Is this plant monosomic in the S orT genome? Show why it cannot be the other genome as part of your solutions

Nicotiana tabacum evolved from the hybridization of N. sylvestris and N. tomentosa, followed by…

Answered: Nicotiana tabacum is presumed to be an…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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A tomato geneticist attempts to assign five recessivemutations to specific chromosomes by using trisomics.She crosses each homozygous mutant (2n) with each ofthree trisomics, in which chromosomes 1, 7, and 10 takepart. From these crosses, the geneticist selects trisomicprogeny (which are less vigorous) and backcrosses themto the appropriate homozygous recessive. The diploidprogeny from these crosses are examined. Her results, inwhich the ratios are wild type:mutant, are as follows:Which of the mutations can the geneticist assign towhich chromosomes? (Explain your answer fully.)
You would like to create new hybrid strains between various cereal grains of different ploidies. Which of the following crosses will yield a fertile hybrid? Select all correct answers. (note that tri=3, tetra=4, penta=5, hexa= 6, and octa=8) 0 0 0 0 pentaploid X triploid tetraploid X diploid octaploid X diploid hexaploid X diploid
"The genotype of the organism producing the crossovergametes must be heterozygous at all loci underconsideration" Explain this statement ?
Species I has 2 n = 16 chromosomes. How many chromosomes will be found per cell in the following mutants in this species? Q. Autotetraploid
Design a scheme for each possible outcome of the cross in figure and label the parental and and recombinant progeny.
A diploid species has 3 pairs of chromosomes in its somatic cells. In males, the first pair is large submetacentric[1]; the second is medium acrocentric[2], and the third is small telocentric[3]. In females, the first two pairs are like those of the males while the third is large metacentric[4][5], with satellite4 Illustrate the karyograms (drawing/picture of the chromosome) of the following: A triploid cell in females tetrasomic cell in males tetraploid cell in females [1] submetacentric --centrosome is just above the middle of the chromosome [2] acrocentric --centrosome is much higher location than submetacentric so that the “p” arm of the chromosome is much shorter than the q arm [3] telocentric --the centromere is at the end of the chromosome [4] metacentric --centrosome is in the middle of the chromosome; thus the “p-arm” and the “q-arm” or both arms of the chromosome are equal in length [5] satellite-a constriction in an arm of a chromosome, aside…
How many Barr bodies are present in the interphase cells of the ff. individuals? A) Klinefelters where 2n = 48 (assume no autosomal aneuploidy in this individual) (b) metafemales with chromosome number of 48 (no autosomal aneuploidy in this individual). Show solutions.
In the figure below, black and pink lines are used to represent nonhomologous chromosomes. Which of the figures matches the following descriptions? More than one diagram may correspond to any one statement, and a diagram may be a correct answer for more than one question. 1) Gametes produced by a reciprocal translocation heterozygote: 2) Genetically balanced gametes produced by a reciprocal translocation heterozygote:
An individual that is heterozygous for an inversion has the following chromosomes(∗ is the centromere):M N O P Q • R S T Um n o t s r • q p u Assume that a crossover occurred between P and Q. Starting with “M” allele, list the remaining genes in order (NO spaces between the letters) of the chromosome resulting from crossing over. You must use upper and lower-case letters correctly and the * symbol for the centromere(s).
In this test cross of AaBbCc you got these results: 100 АВС 100 abc 100 ABC 100 abC 25Abc 25ABC 25 аBС 25 аВс a) Which two genes are linked? Show or explain how you know. b) How far apart are those genes?
Create a chromosome map for each set of three genes from the given information. b) the crossover frequency between gene X and gene Z is 8.5 %, the crossover frequency between gene Y and gene Z is 2.25 % and between gene Y and gene X is 6.25 %
The genes S and T show complete linkage. If a heterozygous individual (whose parents were SSTT x sstt) were to produce gametes, which distribution below is most likely? a) S,s,T and t gametes in a 1:1:1:1 ratio b) ST and st gametes in a 1:1 RATIO c) ST, St, sT and st gametes in a 1:1:1:1 ratio d) SsTt gamete is the only type produced

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