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During prophase of meiosis 1 chromosomes from the organisms father called paternal chromosomes pair up with homologous maternal chromosomes donated by the mother to form a bythis process is called?
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∙ 12y ago
Plato = B tetrad synapsis
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∙ 12y ago
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What are the homologous chromosomes and where does the an individual receive homologous chromosomes from?
Two chromosomes are homologous if they have the same genes at the same loci (position). In a homologous pair, there is one chromosome from the mother (maternal) and one from the father (paternal).
True or false in humans each pair of the 22 maternal autosomes has a homologous paternal chromosome?
False, A haploid organism only has one set of chromosomes, so it has no homologous chromosomes.
Is there a maternal gene?
there are both paternal and maternal chromosomes, which carry maternal/paternal genes.
Homologous pairs of chromosomes are?
Pairs of chromosomes with approximately the same size and centromere position, with the exception of XY pairs. You get one from the maternal side and one from the paternal side.
What is the difference between a chromatid and a sister chromatid?
Homologous chromosomes is a pair made of a paternal and maternal chromosomes. But sister chromatid is either pairs of paternal or maternal chromosomes
How do sister chromatids differ from homolohous chromosomes?
Homologous chromosomes is a pair made of a paternal and maternal chromosomes. But sister chromatid is either pairs of paternal or maternal chromosomes
What are the homologous chromosomes and where does the an individual receive homologous chromosomes from?
Two chromosomes are homologous if they have the same genes at the same loci (position). In a homologous pair, there is one chromosome from the mother (maternal) and one from the father (paternal).
What are chromosomes with same size and shape?
The chromosomes with the same gene content, size, and shape in diploid organism is called homologous chromosomes. The set of chromosome each came from maternal and paternal chromosome.
True or false in humans each pair of the 22 maternal autosomes has a homologous paternal chromosome?
False, A haploid organism only has one set of chromosomes, so it has no homologous chromosomes.
Is there a maternal gene?
there are both paternal and maternal chromosomes, which carry maternal/paternal genes.
Homologous pairs of chromosomes are?
Pairs of chromosomes with approximately the same size and centromere position, with the exception of XY pairs. You get one from the maternal side and one from the paternal side.
What is the difference between a chromatid and a sister chromatid?
Homologous chromosomes is a pair made of a paternal and maternal chromosomes. But sister chromatid is either pairs of paternal or maternal chromosomes
What happens in meiosis during phase 1?
The homologous pairs of chromosomes line up together forming tetrads. During this time, chromatids from the homologous chromosomes cross over and exchange segments so that each chromatid contains both maternal and paternal DNA.
One set of chromosomes from the father?
Chromosomes from the father are called y chromosomes.
What is the event that results when the maternal and paternal chromosomes combine?
Fertilization
How does sexual reproduction creates variety?
Crossing overIndependent assortmentRandom fertilizationMutation1. Crossing overCrossing over is the exchange of corresponding segments of non-sister chromatids of homologous chromosomes. During prophase I (of meisosis I), homologous chromosomes synapse to form aggregates called either bivalents (bi = 2, and there are two homologous chromosomes in the aggregate) or tetrads (tetra = 4, and there are 4 chromatids in the aggregate). While the chromosomes are synapsed in prophase I, crossing over occurs. As a result, a chromatid that originally consisted of 100% maternal alleles and a chromatid that originally consisted of 100% paternal alleles become chromatids with a mixture of both maternal and paternal alleles. This shuffles genetic information and increases variation.2. Independent assortmentIn metaphase I (of meiosis I), the tetrads (bivalents) line up at the center of the cell. Which pole the maternal and paternal chromosomes face is a matter of chance; and the direction the maternal and paternal chromosomes face in one tetrad has no bearing on which way the maternal and paternal chromosomes of another tetrad face. Thus, when the homologous chromosomes separate and move to opposite poles, each pole will receive a mix of maternal and paternal chromosomes. This shuffles genetic information and increases variation.3. Random fertilizationBecause of the above processes, male animals can potentially produce millions or hundreds of millions of genetically unique sperm. And, male animals typically release millions of sperm during sex. Which one of the millions of genetically unique sperm happens to end up fertilizing the egg is largely a matter of chance. Thus, except foridentical twins, siblings never have exactly the same genetic information.4 Mutation takes place during replication of DNA which result in new varieties .
What creates different combinations of maternal and paternal chromosomes in gametes?
Independent assortment
