logo

Video encyclopedia

Outbreeding depression

1:37

Outbreeding concerns outlined in Cayman green sea turtle study

1:27

What is INBREEDING DEPRESSION? What does INBREEDING DEPRESSION mean?

2:09

Animal breeding | inbreeding Vs outbreeding Vs outcrossing Vs crossbreeding | explained| trickwallah

0:49

What does outbreeding mean?

0:38

Why does inbreeding depression occur?

In biology, outbreeding depression is when progeny resulting from crosses between genetically distant individuals (outcrossing) exhibit lower fitness in the parental environment than either of their parents or than progeny from crosses between individuals that are more closely related. The concept is opposed to inbreeding depression, although the two effects can occur simultaneously. Outbreeding depression manifests most significantly in two ways:Intermediate genotypes are not adapted to either parental habitat. For example, selection in one population might favor a large body size, whereas in another population small body size might be more advantageous, while individuals with intermediate body sizes are comparatively disadvantaged in both populations. As another example, in the Tatra Mountains, the introduction of ibex from the Middle East resulted in hybrids which produced calves at the coldest time of the year. Breakdown of biochemical or physiological compatibility. Within isolated breeding populations, alleles are selected in the context of the local genetic background. Because the same alleles may have rather different effects in different genetic backgrounds, there is the potential evolution of different locally adapted gene complexes. Outcrossing between individuals with differently adapted gene complexes can result in disruption of this selective advantage, resulting in a loss of fitness.
    Explore contextually related video stories in a new eye-catching way. Try Combster now!