In the figure above, the unlettered circle represents a diploid nucleus with fou
ID: 176210 • Letter: I
Question
In the figure above, the unlettered circle represents a diploid nucleus with four chromosomes. One pair of homologous chromosomes is long, the other short. One haploid set is black, the other gray. A product of meiosis 1 and a nucleus at Telophase II are represented by which lettered circles, respectively? Explain. Caenorhabditis elegans (the famous model organism used in biomedical research for which 3 Nobel prizes have been awarded) has 5 autosomesand an X chromosome. Hermaphrodites have two X chromosomes (XX) and males have only one (that is, males are XO. where the "O" stands for *no homolog for the X". or "nullo"). What is the total number ol possible combinations of chromosomes in C. elegans male sperm due to Independent assortment at Metaphase 1 of meiosis? [Another way to think about the question is. disregarding recombination/crossing-over what is the total number of genetically different male gametes produced, assuming that homologous pairs are different in at least one locus?)Explanation / Answer
1. A product of meisis 1 is represented by the circle c. Because at the end of meiosis one, the product formed is diploid. two homologous chromosomes are there. the nucleus at telophase II is shown by the circle E because at the end of telophase II, four haploid chromosomes are produced. So the two will have long arms and other two will have short arms.
Other than these, A represents end of mitosis.
B represents start of meiosis I
D represents metaphase II of meisosis II.