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Homologous chromosomes are individual chromosomes inherited from each parent. Sister chromatids are the result of DNA replication, and the are identical.
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∙ 9y ago
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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 is the difference between synapsis and crossing over?
-- synapsis: homologous chromosomes are coming close together and bivalents are formed.-- crossing-over: non-sister chromatids of homologous chromosomes interchange genesThe pairing (formation of bivalents) allows crossing over to take place and this enables genetic variations in the gametes.
What is the site of crossing over between two non-sister chromatids?
Chiasma - The microscopically visible site where crossing over has occurred between chromatids of homologous chromosomes during prophase I of meiosis.
Why do you use non-sister chromatids to demonstrate crossing over?
Crossing over occurs between homologous chromosomes, which are not identical, as one member of each pair of homologous chromosomes comes from the mother, and one member comes from the father. Sister chromatids are identical and crossing over would have no effect.
What is the difference between a diploid cell and a haploid cell?
A diploid cell differs from haploid is that the diploid cell has homologous chromosomes as when the haploid cell doesn't have homologous chromosomes.
What is the difference between a haploid cell and diploid cell?
A diploid cell differs from haploid is that the diploid cell has homologous chromosomes as when the haploid cell doesn't have homologous chromosomes.
What is the difference between a haploid cell and the diploid cell?
A diploid cell differs from haploid is that the diploid cell has homologous chromosomes as when the haploid cell doesn't have homologous chromosomes.
Similarities between Homologous chromosomes and sister chromatids?
Homologous chromosomes are two sister chomatids stuck together with cohesins forming a tetrad. They have the same genes but not necissarily the same alleles, so they could carry hair color, one with brown the other with blonde. So, homologous chromosomes share the same gene.
What is the difference between crossing over and chiasma?
Synapsis is the process in which the genetic material is exchanged between two homologous non sister chromatids (the pair of chromosomes which are same in shape,size but not identical) whereas chaisma is the actual site where synapsis occur.
Explain the exchange of chromosome segments between chromatids of homologous or non-homologous chromosomes?
a. crossing over b. independent assortment or c. random fertilization
What occurs during prophase 1 of meiosis?
In Prophase I: - The duplicated chromatin condenses. Each chromosome consists of two, closely associated sister chromatids. - DNA is exchanged between homologous (similar) chromosomes in a process called 'homologous recombination'. - This often results in the non-sister chromatids crossing over*. The new combinations of DNA created during crossover are a significant source of genetic variation. *at points called chiasmata (plural; singular chiasma).
What is the exchange of genes between homologous pairs of chromosomes?
homologous chromosomes exchange alleles during crossing over.
