Difference Between Heterosis and Inbreeding Depression

Heterosis refers to the increased function of any biological quality in a hybrid offspring, while inbreeding depression refers to the reduced biological fitness in a given population as a result of inbreeding, or breeding of related individuals.

1. What is heterosis and inbreeding depression?
2. What is hybrid vigor and inbreeding depression?
3. What is meant by inbreeding depression?
4. What is the definition of heterosis?
5. What is the opposite of inbreeding?
6. What are the major effects of heterosis?
7. Does hybrid vigor apply to humans?
8. Does inbreeding increases heterosis?
9. Why is hybrid Vigour lost after a few generation?

What is heterosis and inbreeding depression?

Inbreeding depression is the reduced survival and fertility of offspring of related individuals. Large effects are documented in wild animal and plant populations, as well as in humans. Intercrossing inbred strains improves yield (heterosis).

What is hybrid vigor and inbreeding depression?

Heterosis or hybrid vigor is a phenomenon in which the F1 progeny is superior in characteristics than its inbred parents. Inbreeding depression refers to the reduced vigor in the offspring from matings involving related parents.

What is meant by inbreeding depression?

Inbreeding depression refers to declines in average individual fitness in small population sizes due to mating by related individuals resulting in the expression of recessive traits and increased genetic load.

What is the definition of heterosis?

Heterosis, also called hybrid vigour, the increase in such characteristics as size, growth rate, fertility, and yield of a hybrid organism over those of its parents. Plant and animal breeders exploit heterosis by mating two different pure-bred lines that have certain desirable traits.

What is the opposite of inbreeding?

Heterosis, otherwise known as outbreeding enhancement, is the opposite of inbreeding depression and is sometimes referred to as hybrid vigor.

What are the major effects of heterosis?

Heterosis has a positive effect because in the crossbreds many genes are heterozygous that were homozygous in the parent breeds. Alleles with a negative effect are often recessive. In the crossbreds these negative recessive alleles are ruled out.

Does hybrid vigor apply to humans?

Cross-breeding between different species or populations can cause “hybrid vigour”, or heterosis, resulting in offspring who are genetically fitter than their parents. While this phenomenon is widely recognised in some plants and animals, it is poorly understood in humans.

Does inbreeding increases heterosis?

Inbreeding results in homozygosity, which increases the chances of offspring being affected by recessive or deleterious traits. ... Thus a cross between two purebreds will produce progeny exhibiting individual heterosis, which will show improved survival rates.

Why is hybrid Vigour lost after a few generation?

The average trait value of the first-generation (F1) hybrids is higher than that of the mid-parent value (mP) of the two parental inbred lines P1 and P2. plants leads to a progressive reduction of heterosis in the following generations (green). ...