Two genes $R$ and $Y$ are located very close on the chromosomal linkage map of maize plant. When $RRYY$ and $rryy$ genotypes are hybridized, then $F_{2}$-segregation wii show

When two genes are situated very close to each other in a chromosome

What is recombination ? Discuss the applications of recombination from the point of view of genetic engineering.

Alleles of different genes that are on the same chromosome may occasionally be separated by a phenomenon known as

$A$ : Morgan's cross III was conducted in Drosophila to locate genes on chromosome for white eye colour.
$R$ : The cross was done between red eyed hybrid female and white eyed male.