Recombination
- Recombination is a process by which pieces of DNA are broken and recombined to produce new combinations of alleles.
- Crossovers result in recombination and the exchange of genetic material between the maternal and paternal chromosomes.
- As a result, offspring can have different combinations of genes than their parents.
Coefficient of coincidence
- In genetics, the coefficient of coincidence (c.o.c.) is a measure of interference in the formation of chromosomal crossovers during meiosis.
- It is generally the case that, if there is a crossover at one spot on a chromosome, this decreases the likelihood of a crossover in a nearby spot. This is called interference.
Linkage Map
- A linkage map (also known as a genetic map) is a table for a species or experimental population that shows the position of its known genes or genetic markers relative to each other in terms of recombination frequency, rather than a specific physical distance along each chromosome.
- Genetic linkage map, also known as genetic map, is a linear graph of the sequence and relative distance of molecular markers on chromosome based on the frequencies of recombination between markers during crossover of homologous chromosomes.
Map Unit
- In genetics, a centimorgan (abbreviated cM) or map unit (m.u.) is a unit for measuring genetic linkage.
- It is defined as the distance between chromosome positions (also termed loci or markers) for which the expected average number of intervening chromosomal crossovers in a single generation is 0.01.
Three-point cross
- In genetics, a three-point cross is used to determine the loci of three genes in an organism’s genome.
- If the recombination frequency is greater than 50 percent, it means that the genes are unlinked – they are either located on different chromosomes or are sufficiently distant from each other on the same chromosome.
Two-point cross
- It is a cross in which two genes participate.
- So, a cross between a dihybrid and a double recessive homozygous individual is known as two-point cross.