1. The alignment of random chromosome takes place in metaphase that results in variation.
2. During sexual reproduction the fusion of male gamete and female gamete takes place. It is required for the formation of offspring that acquire genes from both the parent.
3. The non-sister chromatids exchange genetic information during prophase I.
Metaphase I is the stage of the meiosis I. It is a process by which a single cell divides to form two daughter cells. During metaphase I, homologue pairs of chromosomes are lined up in the opposite direction or poles. The alignment of each pair is random and occurs at the center of the cell. This phase helps in ensuring that the equal number of chromosomes (two copies of chromosome) is present in the daughter cells.
Reproduction is the process by which a new living organism produces either from sexual or asexual method. Sexual reproduction is a biological process that requires male and female gamete. A female gamete called ova or egg has acquired half of the chromosome and a male gamete called sperm acquires another half of the chromosome. During fertilization, the male gamete fused with female gamete and forms a zygote. The zygote contains a complete pair of chromosome and it further developed into the embryo.
Prophase is the part of the meiosis that only occurs in the eukaryotic cells because they contain genetic material (DNA). Prophase is the process that includes five different stages. In this phase, the allele (genetic material) crosses over and recombines that result in the formation of non-identical haploid chromatids.
1. Learn more about meiosis
2. Learn more about the process of molecular diffusion in a cell
3. Learn more about human sperm and egg cell
Grade: High School
Meiosis, daughter, chromosome, organism, sexual, asexual, reproduction, fertilization, gamete, zygote, embryo, eukaryotic, allele, haploid, chromatids, DNA.
in order goes like this
got it right
The correct answer would be:occurs in metaphase I - is random chromosome alignment resulting in variation. occurs during sexual reproduction - fuses gametes to form offspring with genes from each parent occurs in prophase I - exchanges genetic information between non-sister chromatids
Metaphase I is a stage of meiosis I during which chromosomes are randomly aligned at the metaphase plate. The chromosomes are randomly distributed into two daughter cells after meiosis I. Random segregation of chromosomes adds genetic variation in a population.
Sexual reproduction involves the formation and fusion of gametes. Each gamete is contributed by each parent. The fusion of these gametes results in the formation of a new combination of genes which are different from either parent.
Prophase I is the first stage of meiosis I during which the event of crossing over takes place. Crossing refers to the exchange of genetic material between non-sister chromatids of homologous chromosomes.
Three types of genetic recombination are - Transduction, Transformation and Conjugation
There are three modes of genetic recombination –
a)Transduction – In the DNA form one bacteria is transferred to other bacteria with the help of virus.
b)Transformation – In transformation, some species of bacteria’s are able to ingest DNA or its segment (plasmid) from its surrounding into its own DNA.
c)Conjugation – It requires physical contact just like sex. When two cells come close to each other they share genetic material either chromosome or plasmid through a bridging structure called a pilus
Illegitimate or nonhomologous recombination occurs in regions where no large-scale sequence similarity is apparent, e.g. translocations between different chromosomes or deletions that remove several genes along a chromosome. However, when the DNA sequence at the breakpoints for these events is analyzed, short regions of sequence similarity are found in some cases. For instance, recombination between two similar genes that are several million bp apart can lead to deletion of the intervening genes in somatic cells.
Site-specific recombination occurs between particular short sequences (about 12 to 24 bp) present on otherwise dissimilar parental molecules. Site-specific recombination requires a special enzymatic machinery, basically one enzyme or enzyme system for each particular site. Good examples are the systems for integration of some bacteriophage, such as l, into a bacterial chromosome and the rearrangement of immunoglobulin genes in vertebrate animals.
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