What would be the result from a nondisjunction of chromosome 21 in a zygote that is 46,XY? Explain your answer

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?

Please explain the outcomes of nondisjunction in meiosis one versus nondisjunction in meiosis two, in terms of the effect on the gametes. Please give an example of a defect that results from nondisjunction in meiosis.

In a diploid organism that has a haploid complement of n=10, what is the formula and chromosome compliment of each individual? Chromosome complement Formula Total number of chromosomes 1. Trisomy      2. Monosomy     3. Tetraploid      4. Triploid

What will be the number of chromosomes in Turner’s syndrome and Klinefelter's syndrome of an organism whose haploid number is 20

10:10 E ← sisAndMeiosis.docx FREE EDIT PDF FREE CONVERT PDF TO WORD 2. Why are chromosomes important? 3. How are meiosis I and meiosis II different? 1. What is the state of DNA at the end of meiosis I? What about at the end of meiosis II? 4. Why do you use non-sister chromatids to demonstrate crossing over? 7. Identify two ways that meiosis contributes to genetic recombination. 10. P FREE PDF FILLER 5. What combination of alleles could result from a crossover between BD and bd chromosomes? 8. Why is it necessary to reduce the number of chromosomes in gametes? 6. How many nuclei are present at the end of meiosis II? How many chromosomes are in each? a. Sperm Cell b. Egg Cell AP_5 c. Daughter Cell from Mitosis ON 5G I 9. Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following: d. Daughter Cell from Meiosis II COUS ra PAGE 10... FREE CONVERT JPG TO PDF X OeScience Labs, 2016

In fruit flies, chromosomal crossing over does not occur in meiosis in males, whereas crossing over does occur in meiosis in females. In fruit flies that are heterozygous at many genes (i.e. many maternal and paternal versions of the genes differ), at what stage would cells no longer be heterozygous for any gene during the process of meiosis? a)After the second meiotic division in males, and after the first meiotic division in females. b)After the second meiotic division in both males and females. c)After the first meiotic division in both males and females. d)After the first meiotic division in males, and after the second meiotic division in females.

Why is meiosis necessary for sexual recombinations?

The mosquito, Aedes aegypti, has 3 bivalents (homologous pairs) formed at Meiosis I. How many chromosomes and chromatin strands are present in each of the following stages:

A diploid (2n) trihybrid individual with the genotype EeFfGg can make eight genetically different gametes.  Loci E/e and F/f are on chromosome 1 and locus G/g is on chromosome 2. Explain how a gamete containing the alleles e, f and g may be produced by meiosis. Refer specifically to meiotic events occurring during Prophase I, Metaphase I, Anaphase I and Anaphase II. (NB: remember to refer to the organism above).