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Why crossing over takes place?
Occurs during prophase I of meiosis (pachytene) in a process called synapsis. Crossover usually occurs when matching regions on matchingchromosomes break and then reconnect to the other chromosome. The value of crossing over is that each parent has a different daughter cell.
Is crossing over takes place in sperms before fertilization?
Crossing over occurs during fertilization. This is the mixing of alleles from each of the parents in order to make the offspring.
Does random alignment of chromosomes during Meiosis produce genetic variations?
In meiosis crossing over may occur at certain points on a chromatid. Crossing over is where variation occurs in allele combination. When a Zygote is formed alleles from mother and father cross over.. this is why you may have some features resembling your father and your mother... or grandma or grandpa... etc... There can be mutations ( messups ) in mitosis but the actual process results in no genetic variation. AP bio
Why genetic variation is still possible if self pollination occurs?
This is because during meiosis there is (mostly) genetic variation by means of crossing over, independent assortment and mutations. As two gametes are being fused, the end product will be different from the parent, because the factors mentioned above ensure this. For a bit more info: The end product might not always be different as sometimes (in a very rare case), independent assortment and mutations might not occur to the two gametes which are to be fertilised, and if the two gametes both contained chromosomes on which crossing over did not occur, and if these two gametes were to fertilise, then the product would be genetically the same as the parent plant.
How genetic information is kept constant through cell division?
when cell division occurs chromosomes segregate & also the genes present in pairs on then as the genes store genetic information it is kept constant though cell division
Are chromosomes in a duplicated or in unduplicated state when crossing over occurs?
It is in a duplicated state.
What phase of the cell cycle has a single line of chromosomes?
During the G1 phase of the cell cycle, chromosomes are not yet duplicated and appear as a single line of chromosomes within the cell. This is before DNA replication occurs in the S phase and chromosomes are temporarily duplicated.
When are cells haploid but the chromosomes are still in the duplicated state?
my college bio proffessor told me that even though chromosomes are still in the duplicated state, the chromosomes are duplicated so technically they do have "23" chromosomes but they instead have 2 sets of it. these 2 sets are the same so they dont count as a "full" set of 46 chromosomes. :) hope this helps!!
When does crossing over take place between homologous chromosomes during meiosis?
Crossing over between homologous chromosomes occurs during prophase I of meiosis.
What action occurs during meiosis exchanging pieces of chromosomes between homologous chromosomes?
The action that occurs during meiosis that involves exchanging pieces of chromosomes between homologous chromosomes is called crossing over. This leads to genetic variation among offspring by creating new combinations of genes.
During which phase of the cell cycle are duplicated chromosomes present?
The S phase in the interphase. Chromosomes are copied in the interphase part of the cell cycle S phase would be the answer. It is during Interphase (G1, S, G2) that they are copied. SO dependant on your answers it's either interphase or S.
Which period are chromosomes duplicated in?
Chromosomes are duplicated during the S phase of the cell cycle, which occurs during interphase. This is when DNA replication takes place to ensure that each daughter cell receives a complete set of chromosomes during cell division.
When Crossing over of chromosome occurs during what?
Crossing over of chromosomes occurs during meiosis, specifically during prophase I. This process involves the exchange of genetic material between homologous chromosomes, leading to genetic variation among offspring.
When does crossing over occur for oogenesis?
Crossing over occurs during prophase I of meiosis I in oogenesis, which is when homologous chromosomes exchange genetic material. This process increases genetic diversity by shuffling genetic information between maternal and paternal chromosomes.
What occurs in meiosos but not in mitosis?
lining up of tetrads, crossing over, and separation of homologous chromosomes.
Why crossing over occurs?
Usually,crossing over occurs to create new species of life.In the case of chromosomes,2 non sister chromatids link up at chiasmata and crossover.Crossing over usually leads to evolution of new species.
How do the chromosomes become different from eachotther in meiosis?
The chromosomes become different from each other due to crossing over which occurs during prophase I.
