The accompanying illustration shows one possible outcome of the random alignment of homologous chromosomes at metaphase I. Chromosome segregation in anaphase I is consistent with which statement?

In a turtle species, a diploid cell in the G1 phase of the cell cycle contains 22 picograms of DNA (picogram is a measure of the total mass of the DNA present). How much DNA is present in a cell of the same species at prophase II of meiosis (prophase of the second meiotic division)?

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?

During meiosis, when crossing-over occurs between two homologous chromosomes, it does not happen at a single point, but rather two points with a stretch of DNA in between. What are the two junction points called?What is the region between the two points called and what is different about this region compared to how double-stranded DNA usually is?If the region described in b.) is located within a gene and the two homologues have different alleles of this gene, what might happen that is a direct violation of Mendel’s first law? (Describe the process with 2-3 sentences of detail.)

Mutations in genes that affect meiosis have been identified in many different model organisms.  Most of these mutations result in aneuploidy of more than a single chromosome and are nearly sterile.  Explain why this is the case.

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…

In a Drosophila where somatic cells have 8 chromosomes, and gametes have 4 chromosomes, what is the number of tetrads in a cell during metaphase II?

Which of the following statement(s) regarding homologous chromosomes is (are) true? CHOOSE ALL THAT APPLY Homolgues contain the same genes but their order on the chromosome differs In each tetraploid cell, there are two homologous chromosomes Homologous pairs exist in haploid cells. Homolgues contain the same genes but might contain different alleles Homologues become physically connected (pair up) during prophase I

Choose the phase of meiosis in column 2 that best matches each event in column 1.                                                                                                         one haploid set of replicated chromosomes at each spindle pole                                                                                                         genetic recombination events take place                                                                                                         shortest stage                                                                                                         aligning of bivalents in the center of a spindle                                                                                                         one haploid set of unreplicated chromosomes at each spindle pole                                                                                                         aligning of monovalents in the…

Human somatic cells have 46 chromosomes. Are the cells different in any way from the parent cell and what is chromosome count of each of those cells once they have finished mitosis?