For meiosis to occur. What causes unequal crossover Pairing up of homologous chromosomes. Exchanges of equal genetic material. Exchanges of unequal amounts of genetic material. Mismatched sequence due to non-homologous crossover may result in Insertion mutation. Deletion mutation. Insertion or deletion mutation. Your Name. To Email. Time is Up! Neural Control Mechanisms Neurons generate electric signals that they pass along to the other neurons or target tissues.
Regulation of Organic Metabolism, Growth and Energy Balance The human body is capable of regulating growth and energy balance through various feedback mechanisms. Chromosome Mutations Mutations can also influence the phenotype of an organism.
The Water Cycle The water cycle also referred to as the hydrological cycle is a system of continuous transfer of water from the air, s.. Related Articles So if you have two Chromosome 1s lined up, one strand of one Chromosome 1 will break and it will reanneal with a similar breakage on the other Chromosome 1. So that then the new chromosome that will happen will have part of, say, the maternal Chromosome 1 and the paternal Chromosome 1, where maternal and paternal means where that person got their Chromosomes 1s from, their one or their two.
Therefore, the child that's formed out of one of those Chromosome 1s now has a piece of his or her grandmother's Chromosome 1 and a piece of his or her grandfather's Chromosome 1. And it's this crossing over that lets recombination across generations of genetic material happen, and it also allows us to use that information to find the locations of genes. Joan E. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.
Hanley Rd, Suite St. Louis, MO Subject optional. Email address: Your name:. Example Question 1 : Understanding Crossing Over. Possible Answers: Metaphase I.
Correct answer: Prophase I. Explanation : During prophase I homologous chromosomes will line up with one another, forming tetrads. Report an Error. What is the evolutionary purpose of cells that undergo crossing over? Possible Answers: To produce gametes that are genetically identical.
Correct answer: To increase genetic diversity. Explanation : Crossing over is a process that happens between homologous chromosomes in order to increase genetic diversity. Example Question 3 : Understanding Crossing Over.
During which step of cell division does crossing over occur? Possible Answers: Metaphase II. Explanation : When chromatids "cross over," homologous chromosomes trade pieces of genetic material, resulting in novel combinations of alleles, though the same genes are still present. Example Question 4 : Understanding Crossing Over. What structures exchange genetic material during crossing over? Possible Answers: Egg and sperm chromosomes.
Correct answer: Nonsister chromatids. Explanation : During crossing over, homologous chromosomes come together in order to form a tetrad. Example Question 5 : Understanding Crossing Over. Crossover of homologous chromosomes in meiosis occurs during which phase? Possible Answers: Prophase II of meiosis. Correct answer: Prophase I of meiosis.
Explanation : The crossing over of homologous chromosomes occurs in prophase I of meiosis. Example Question 6 : Understanding Crossing Over. During crossing over, two homologous chromosomes pair to form which of the following choices? Possible Answers: Tetrad.
Correct answer: Tetrad. Explanation : The tetrad, which divides into non-sister chromatids, exchanges genetic information in order to make the genetic pool more variant, and result in combinations of phenotypic traits that can occur outside of linked genotypic coding. Example Question 7 : Understanding Crossing Over.
Chromosomal crossover occurs in which phase of meiosis? Possible Answers: Anaphase II. Explanation : During prophase I, homologous chromosomes pair with each other and exchange genetic material in a process called chromosomal crossover.
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