AGR 3303 Lecture Notes - Lecture 7: Synapsis, Centromere, Wild Type
2 Feb 2019
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Chromosome variations: members of diploid species contain two haploid chromosome sets, modifications, changes in chromosomes structure, within or among chromosomes, changes in chromosome number, chromosome mutations on a broad level. Results within zygote will be either trisomic or monosomic: slide 4 : bottom illustration of meiosis i that does correctly disjoin creating 2 normal gametes on the bottom but the sister chromatid on top fail to disjoin. Fertilization will give us one trisomic and one monosomic (half normal and half not regular: slide 4: in mitosis one sister chromosome fails to disjoin so there creates one clone of trisomic and one monosomic. Monosomy loss of a chromosome, ex. Turner syndrome in females that are missing an x chromosome, has 45 chromosomes. Not well tolerated in humans but could be tolerated in plants. Polysomy/trisomy plants and animals are more viable than monosomc individuals. Most aneuploid embryos that arise do not survive to term, 30% do not survive to birth (spontaneously abort).
