Based on the text on cockroaches. 1. Compare the genetic relationship to the parent pest and its offsring. Use the word: genetically different, genetic recombination
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
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Roaches Mating
American cockroaches engage in courtship rituals before mating. Females
begin courtship by raising their wings, exposing their integral membranes,
expanding their genital chambers and releasing a pheromone that attracts
males. This stance is referred to as the calling position.
Attracted males approach females and flap their wings to denote interest.
Mating commences when a male cockroach backs into a female cockroach,
depositing sperm.
After fertilization, a female American cockroach produces an egg case
known as an ootheca. Some species of cockroaches are ovoviviparous,
which means they carry the ootheca inside their bodies. In a few species,
the eggs grow inside the female's uterus without the aid of an ootheca. The
developing babies feed on the yolks of the eggs, just as those that grow
outside of their mothers do. Only one species of cockroach is viviparous,
meaning the babies develop inside the mother's uterus surrounded by
amniotic fluid. The young grow and develop just as the offspring of
mammals do until the mother gives birth. The female carries the ootheca on
her abdomen for a short time, usyally a day or two. After that, she deposits
it in a warm humid location.
Nymphs emerge within 38 days and complete their development within six
to 12+ months. The life span of the American cockroach ranges from one to
1.5 years.
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