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- Which of the following features or events occur ONLY during prophase I of meiosis and do NOT occur during EITHER prophase II of meiosis OR prophase/prometaphase of mitosis? Mark all that apply. Chromatin condensation Crossing-over occurs Homologous chromosomes alignment Spindle assembly Synaptonemal complex formationGenomic imprinting refers to the inheritance of: Question 16 options: Gamete specific DNA methylating marks during meiosis. All epigenetic marks during mitosis. DNA methylating marks during mitosis. All epigenetic marks during meiosis. Gamete specific DNA methylating marks during mitosis.Mutations in DNA that result in altered proteins can causehereditary diseases. Pedigree studies and genetic testing mayclarify the risk of disease. At the chromosome level, nondisjunctionduring meiosis can result in gametes with too few or too manychromosomes, most of which produce inviable offspring.Imprinting refers to inactivation of alleles depending on whichparent the alleles come from; offspring in whom imprinting occursappear haploid for the affected gene even though they are diploid. During spermatogenesis, is there any difference in outcome between first- and second-division nondisjunction?
- How linkage and crossing over is inter related explain with suitable exampleWhich of the following chromosomal rearrangements usually results in normal meiosis? translocation homozygote translocation heterozygote paracentric inversion heterozygote pericentric inversion heterozygoteWhich of the following statements is true regarding the phenotypic effects of inversions? Select ALL that apply. Heterozygotes are often healthy individuals because these mutations do not impact the dosages of any genes Heterozygotes often exhibit reduced fertility, because translocated and wild-type chromosomes do not separate correctly during meiosis II Homozygotes are often healthy individuals because these mutations do not impact the dosages of any genes Heterozygotes often exhibit reduced fertility, because crossing over between inverted and wild-type chromosomes in Meiosis I results in inviable gametes Heterozygotes often exhibit reduced fertility, because crossing over between inverted and wild-type chromosomes in Meiosis Il results in inviable gametes
- Which of the following is false regarding Down Syndrome? O can be caused by a Robertsonian translocation which is the fusion of the q arm of chromosome 21 with the q arm of chromosome O can be caused by a nondisjunction event O can be caused by equal exchange of chromatids during crossing over O Down syndrome individuals could possibly have normal childrenHi, I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful! Sometimes nondisjunction will occur in a parent that has normal chromosome numbers and result in an offspring that has abnormal number of chromosomes. The phenotype of the affected offspring will often allow geneticists to determine in which parent and during which division of meiosis the nondisjunction occurred. In each of the examples below, assume the parents have a normal diploid chromosome complement. EXAMPLE 1: A man with the X-linked dominant condition “brown tooth enamel” and a woman with normal tooth enamel produce a son with brown tooth enamel. Let’s call the allele for brown tooth enamel “XB” and normal tooth enamel “Xb”. In which parent did the nondisjunction occur? Explain and/or illustrate Did nondisjunction occur at meiosis I or II? Explain and/or illustrate. What sex chromosomes are in the child’s somatic cells? EXAMPLE 2: The parents in the…Hi, I'm having some trouble with this practice problem from my study guide. If anyone can explain it it would be very helpful! Sometimes nondisjunction will occur in a parent that has normal chromosome numbers and result in an offspring that has abnormal number of chromosomes. The phenotype of the affected offspring will often allow geneticists to determine in which parent and during which division of meiosis the nondisjunction occurred. In each of the examples below, assume the parents have a normal diploid chromosome complement. A man with the X-linked dominant condition “brown tooth enamel” and a woman with normal tooth enamel produce a son with brown tooth enamel. Let’s call the allele for brown tooth enamel “XB” and normal tooth enamel “Xb”. EXAMPLE 1: The parents in the family above produce another son, this time with two Y chromosomes and normal tooth enamel. In which parent did the nondisjunction occur? Explain and/or illustrate. Did nondisjunction occur at meiosis I or II?…
- AsapWhat event/s during meiosis is simulated by the flipping of the coin? Explain these events briefly. Independent/Random Assortment. Explain why? briefly pleaseWhich of the following describes the difference between genetic maternal effect and cytoplasmic inheritance? O Progeny from a Genetic Maternal Effect cross express the phenotype of their mother's genotype, while progeny from a cytoplasmic inheritance cross share a genotype and phenotype of their mother. Progeny from a Genetic Maternal Effect cross have a phenotype that reflects their own genotype, while progeny from a cytoplasmic inheritance cross share a genotype and phenotype with their mother. Progeny from a Genetic Maternal Effect cross have the same genotype as their mother, while progeny from a Cytoplasmic Inheritance cross do not. There is no difference.
