What process produces recombinant gametes?
In eukaryotic cells, which are cells with a nucleus and organelles, recombination typically occurs during meiosis. Meiosis is a form of cell division that produces gametes, or egg and sperm cells. During the first phase of meiosis, the homologous pairs of maternal and paternal chromosomes align.
What are recombinant chromosomes?
Homologous Recombination Paired chromosomes from the male and female parent align so that similar DNA sequences from the paired chromosomes cross over each other. Crossing over results in a shuffling of genetic material and is an important cause of the genetic variation seen among offspring.
Which stage will produce recombinant chromosomes?
Recombination Occurs During the Prolonged Prophase of Meiosis I. Prophase I is the longest and arguably most important segment of meiosis, because recombination occurs during this interval. For many years, cytologists have divided prophase I into multiple segments, based upon the appearance of the meiotic chromosomes.
How does a recombinant chromosome form?
In meiosis and mitosis, recombination occurs between similar molecules of DNA (homologous sequences). In meiosis, non-sister homologous chromosomes pair with each other so that recombination characteristically occurs between non-sister homologues.
What is a recombinant gamete?
a GAMETE containing a new combination of alleles as compared with those found on the HOMOLOGOUS CHROMOSOMES of the parent, the alteration being produced by RECOMBINATION.
What happens during recombination?
When recombination occurs during meiosis, the cell’s homologous chromosomes line up extremely close to one another. Then, the DNA strand within each chromosome breaks in the exact same location, leaving two free ends. Each end then crosses over into the other chromosome and forms a connection called a chiasma.
What are recombinant gametes?
How do recombinant genotypes formed?
The DNA molecules are broken between random but matching nucleotides, and then the DNA fragments are exchanged and rejoined to form two new combinations of genes. For example, recombination between two DNA molecules with the genotypes a+b and ab+ can yield two recombinant DNA molecules with the genotypes a+b+ and ab.
What is recombination and types of recombination?
There are two classes of genetic recombination: general, or homologous, and site-specific. Inhomologous recombination an exchange of genetic material takes place between two pairs of homologous DNA sequences located on two copies of the same chromosome.
What is recombinant genotype?
If meiosis results in recombination, the products are said to have a recombinant genotype. On the other hand, if no recombination occurs during meiosis, the products have their original combinations and are said to have a non-recombinant, or parental genotype.
Which are recombinant gametes?
Two types of gametes are possible when following genes on the same chromosomes. If crossing over does not occur, the products are parental gametes. If crossing over occurs, the products are recombinant gametes.