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- Meiosis Explains Mendels Results: Genes Are on Chromosomes Define the following pedigree symbols:A karyotype shows that a child has Klinefelter syndrome (47,XXY). If the child is also colorblind (due to a recessive X-linked allele), despite his parents having normal color vision, in which parent and stage of meiosis did nondisjunction occur? And explain why .Meiosis is the process used by sexually reproducing organisms and is made up of eight sub-steps or phases. During meiosis, chromosomes can be changed through crossing over and nondisjunction leading to changes in the inherited traits of offspring. Show the importance on inheritance of how steps in meiosis change chromosomes through one of these processes.
- A woman who is homozygous for normal color vision mates with a colorblind male. they produce a female child how has only one X chromosome and who is also color blind. In which parent did the nondisjuction take place? Can you specify which meiotic division?A male baby is born with the sex-chromosomeconstitution XYY. Both parents have normal sex chromosomes(XY in the father, XX in the mother). In which meiotic division ofwhich parent did the nondisjunction take place that produced theXYY baby?Describe one function, brought about by the process of meiosis thatspermatogenesis and oogenesis have in common. Please write the similarities between spermatogenesis and oogenesis in a paragraph ratherthan a table. Please discuss the process mentioning differentiation, multiplication anddivision. How many stages of meiosis do they go through. Please mention if haploid ordiploid cells are formed.
- True or false Meiosis produces cells that have a diploid number or chromosomes?If nondisjunction takes place in a spermatocyte in the second meiotic division and the sperm fertilizes a normal egg, the resulting infant may have three copies of each chromosome three copies of chromosome 13,18 or 21 three copies of chromosome 13,18, 21 or a normal number of chromosomes a normal number of chromosomes one copy of each chromosomeAn individual is born XX. However, due to a rare crossing over event, one of the X chromosomes contains the SRY gene. We would predict that this individual would most likely develop (Choose all that apply): testes ovaries male external genitalia female external genitalia
- The phenotype of an early-stage human embryo is considered sexually indifferent. Explain why this is so even though the embryo’s genotypic sex is already fixed.A women is heterozygous, Aa, for classic albinism and this gene maps to chromosome 11, and is a carrier for haemophilia, an X-linked trait (H/h). Provide a diagram of chromosomes 11 and the sexchromosomes (show the alleles associated with albinism and haemophilia) in the cells involved with normal oogenesis for this female. Start with the oogonium and end with the mature ovum; you can ignore all polar bodies. Your diagrams should show the chromatids clearly and all cells must be labelled. Indicatethe total number of chromosomes and chromatids for each cell stage.The observed chromosome is in what Mitotic or Meiotic Stage?