How is aneuploidy different from polyploidy? What are the mechanisms by which aneuploidy and polyploidy are caused, and what are the consequences of these chromosomal alterations in terms of survival and fertility of the offspring?
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- How is aneuploidy different from polyploidy? What are the mechanisms by which aneuploidy and polyploidy are caused, and what are the consequences of these chromosomal alterations in terms of survival and fertility of the offspring?Explore chromosomal defects among humans in Ensembl at https://www.ensembl.org/index.html?redirect=no(Links to an external site.) Take a screenshot of one of your findings and describe the type of aberration and its associated phenotype. Identify the locus of gene variant(s) responsible for the disorder. Screenshot Name of chromosomal defect Type of aberration and locus of gene variant(s) Phenotype References:Why does aneuploidy increase with maternal age?
- What is aneuploidy? Differentiate between aneuploidy and polyploidy.The diagram below shows a cell during Meiosis II: a) What phase of Meiosis II is the cell in? How do you know? b) Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a gamete from this organism have? c) Draw the same cell during the same phase of Meiosis I. Label the elementsShown below are photomicrographs of Rhoeo tradescantia cells undergoing meiosis. Answer the following question for each of the photomicrographs: Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge). Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph). Explain how these aberrations are formed and relate to the possible causal mutation(s). Will this result to sterile and/or fertile gametes? Explain.
- Discuss the following sets of terms: a) trisomy and triploidy, b) aneuploidy and polyploidy.Define these pairs of terms, and distinguish between them.aneuploidy/euploidymonosomy/trisomyPatau syndrome/Edwards syndromeautopolyploidy/allopolyploidyautotetraploid/amphidiploidparacentric inversion/pericentric inversionAneuploidy is typically detrimental, whereas polyploidy is sometimes beneficial, particularly in plants. Discuss why you think this is the case.
- What is chromosomal mapping?Discuss the following sets of terms: a. trisomy and triploidy b. aneuploidy and polyploidyConsider a Droscophilia fly with a genotype of Nn XqYY. The dominant allele of the sex-linked gene specifies a black body and the recessive a white body. The recessive autosomal allele specifies hairy bristles while the dominant allele specifies smooth bristles. i)What is the ploidy of this fly? ii) What would the sex of this fly be? iii)What would the phenotype of this fly be with respect to these two loci?