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 occur

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 occur

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Description: The frequency of single crossover recombinant gametes (those with chromosomes having crossed over) occurring is half the frequency of the actualcrossing over event. What would best explain this?O Each crossover takes place between only non-sister ch

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter14: Chromosomes And Human Inheritance

Section: Chapter Questions

Problem 5GP: Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With...

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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?
In Figure 4-3, would there be any meiotic products thatdid not undergo a crossover in the meiosis illustrated? Ifso, what colors would they be in the color conventionused?
n Figure 4-19, what would be the RF between A/a andB/b in a cross in which purely by chance all meioses hadfour-strand double crossovers in that region?
Inversion heterozygotes can have a higher probability of producing gametes that are abnormal in their genetic content because: O these homologous chromosomes can't pair during meiosis I crossovers within an inversion loop can alter the genetic composition O misalignment of genes during crossover events O they produce translocations both chromosomes contain the same inversion
What could cause the ratio in a dihybrid cross to not be 9:3:3:1? O random assortment O parents are both heterozygous independent movement of chromosomes asexual reproduction linked genes
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,
In Figure 4-10, what is the mean frequency of crossoversper meiosis in the region A–B? The region B–C?
Imagine this cell will produce eggs (but the chromosomes have not replicated yet). At the end of the stages of meiosis: which genotypes are possible at the C and D genes only, assuming that recombination from crossover is possible, in total? (Click all that are true). O Cc O Dd D CD Cd O cD O cd ab AB Ab O aB stv DII DD F12 F11 F10 F9 F8 F6 F7 & delete + ||
Draw a diagram that illustrates how these chromosomes pair up during Metaphase I of Meiosis. Be sure to include all chromosomes, chromatids, genes, and centromeres in your diagram.
Figure 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.
Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele? c. If a female is heterozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele?
Which of the following statement is true? Recombinants can be formed by crossovers during meiosis II ORecombinant frequencies lower than 50% are diagnostic for linkage. O Recombinant frequencies higher than 25% are indications of no linkage. O Recombinants of linked genes can be formed in the absence of crossover. O Recombinants cannot be formed without crossovers during meiosis I