Two unrelated species of plants were hybridized. Species A is described as 2n = 16 Species B is described as 2n 10. %3D How many chromosomes are in the hybrid?
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![Two unrelated species of plants were hybridized. Species A is described as 2n = 16.
Species B is described as 2n = 10.
%3D
How many chromosomes are in the hybrid?
Fill in the number of univalents and bivalents you would expect to see in meiosis in
this hybrid.If none of a type are seen, fill in 0.
Univalents
Bivalents
The number of chromosomnes can be doubled in the lab using the chemical
Assume that the number of chromosomes in the hybrid was doubled using the
chemical above. The resulting plant is most likely
Fill in the number of univalents and bivalents you would expect to see in meiosis of
this final hybrid.
none are seen, fill in 0,
Univalents
Bivalents](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6441173a-0d65-4fbd-a72a-c88019a4dfc8%2F8bc978fe-3251-46c0-86ac-9801b98b77ae%2F1c15efb_processed.jpeg&w=3840&q=75)
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- in the experiment of following chromosomal dna mvement througgh meiosis, why. do you use non-sister chromatids to demobstrate crossing over? what combinatiobns of alleles could result from a crossover between BD and bd chromosomes? Identify two ways that meiosis contributes to genetic recombination. Why is it necessary to reduce the number of chromosomes in gametes, but not in other cell?The frequency of single crossover recombinant gametes (those with chromosomes having crossed over) occurring is half the frequency of the actual crossing over event. What would best explain this? O Each crossover takes place between only non-sister chromatids of a homologous chromosome pair O Crossovers occur in about 50% of meiosis events O This doesn't actually occur because all genes are on separate chromosomes O A test cross between a homozygous and heterozygote produces % heterozygotes and % homozygotes progeny O Shugoshin is inappropriately expressed in meiosis II causing nondisjunction to occurFigure 13.6 Which of the following statements about nondisjunction is true? Nondisjunction only results in gametes with n+1 or n-1 chromosomes. Nondisjunction occurring during meiosis II results in 50 percent normal gametes. Nondisjunction during meiosis I results in 50 percent normal gametes. Nondisjunction always results in four different kinds of gametes.
- In the following diagram, designate each daughter cell as diploid (2n) or haploid (n).Figure 7.2 If a mutation occurs so that a fungus is no longer able to produce a minus mating type, will it still be able to reproduce? Figure 7.2 (a) In animals, sexually reproducing adults form haploid gametes from diploid germ cells. (b) Fungi, such as black bread mold (Rhizopus nigricans), have haploid-dominant life cycles. (c) Plants have a life cycle that alternates between a multicellular haploid organism and a multicellular diploid organism. (credit c fern: modification of work by Cory Zanker; credit c gametophyte: modification of work by Vlmastra/Wikimedia Commons)During ascus formation in Neurospora, any ascosporewith a chromosomal deletion dies and appears whitein color. How many of the eight ascospores in theascus would be white if the octad came from a crossof a wild-type strain with a strain of the oppositemating type carrying:a. a paracentric inversion, and no crossovers occurredbetween normal and inverted chromosomes?b. a pericentric inversion, and a single crossoveroccurred in the inversion loop?c. a paracentric inversion, and a single crossoveroccurred outside the inversion loop?d. a reciprocal translocation, and an adjacent-1segregation occurred with no crossovers betweentranslocated chromosomes?e. a reciprocal translocation, and alternate segregationoccurred with no crossovers between translocatedchromosomes?f. a reciprocal translocation, and alternate segregation occurred with one crossover between translocated chromosomes (but not between thetranslocation breakpoint and the centromereof any chromosome)?
- One chromosome of a homologous pair carries the genes J am K. The othen chromosome of the pair carries the genes j and k at corresponding loci. Crossing results in exchange of chromosome segments and production of gametes combinations of genes. A "recombinaut new typegamete resulfing from this cross oven might contain: A-Jaud K D-K and k B-J aud j E-j and K and kWe have discussed meiosis in yeast. One ascus e one melotic event. Two haploid yeast strains are crossed together, one wild type, the other mutant for 2 linked genes. The resulting diploid strain undergoes melosis eventually (=many meiotic events > many asci). A. What will the results be if the 2 genes are very far away from each other (certainly more than 50 map units)? B. What will the results be if the two genes are right next to each other, "no distance at all, zero distance"? (Explain your answers). Results here are patterns of asci and their percentages. Like for example "50% tetratypes, 0% ditypes", etc. If you forgot what a ditype or a tetratype is, you can illustrate them like that.Below is a chromosome with arrows showing the breakpoints of an inversion. ABCDE F.GH 券 What would be the products of meiosis if a chromosome carrying the inversion paired with a wildtype chromosome and crossover occurred between the interval C and D? (Indicate which products would be viable and which would be lethal and why,
- For each of the terms in the left column, choose thebest matching phrase in the right column.a. reciprocal translocation 1. lacking one or morechromosomes or having oneor more extra chromosomesb. gynandromorph 2. movement of short DNAelementsc. pericentric 3. having more than two completesets of chromosomesd. paracentric 4. exact exchange of parts of twononhomologous chromosomese. euploids 5. excluding the centromeref. polyploidy 6. including the centromereg. transposition 7. having complete sets ofchromosomesh. aneuploids 8. mosaic combination of maleand female tissueDRAW IT Suppose, as in the questionat the bottom of Figure 15.9, the parental(P generation) flies were true-breedingfor gray body with vestigial wings andblack body with normal wings. Draw thechromosomes in each of the four possiblekinds of eggs from an F1 female, andlabel each chromosome as “parental”or “recombinant.”Consider the true diploid plant cell (2n=4) below. The paternally derived blue chromosomesare of two types, metacentric and acrocentric. These chromosomes contain the same gene pattern andstructural features as the maternally derived purple chromosomes. Consider two genes A and B whichare found on the metacentric and acrocentric chromosome pairs, respectively. Assume the father passedon A and B alleles, and the mother passed on a and b alleles. a. Show the possible loci of these genes (specify alleles) on the image. Label both sister chromatids in each chromosome. (Note: Sister chromatids are products of replication.)b. Draw the four possible gametes formed after meiosis assuming there was no crossing over. Label the gene loci.
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