Question

Inbreeding depression is due to
(A) Mutation
(B) Vegetative propagation
(C) Cross pollination
(D) Self pollination​

Answer 1

ANSWER:

Inbreeding depression is due to self pollination.

EXPLANATION:

INBREEDING DEPRESSION:

• Continuous self pollination over many generations can lead to inbreeding depression.

• Inbreeding depression causes the reccessive traits to accumulate and express.

• It results in reduced viability and reduced desired characters of organisms.

• Inbreeding depression can be overcome by a single outcross.

FACTS RELATED TO QUESTION:

SELF POLLINATION:

• Pollination occuring between the pollen grain and ovary of the same flower in a plant.

• Self pollinated flowers result in the accumulation of same trait over many generations.

• There are two types of self pollinated flowers like cleistogamous and chasmogamous flowers.

• Self pollinated plants do not require agents for pollination.

CROSS POLLINATION:

• It is of two types: geitonogamy and xenogamgy.

• Cross pollination helps us to get desired and improved varieties.

GEITONOGAMY

• It is pollination of pollen grains of a flower to the ovary of another flower of same plant.

• It is functionally cross pollination but genetically self pollination.

• It requires agents for pollination.

XENOGAMY:

• It is the pollination between pollen grain of a flower in plant to the ovary of flower in another plant of same species or different species.

• It requires agents for pollination.

VEGETATIVE PROPAGATION:

• It is a method of reproduction in plants.

• In this method of reproduction, only vegetative parts are used to develop a new plant.

• Vegetative propagules are the vegetative parts used here.

• They may be offset , stolon , runner , etc.

MUTATION:

• Mutation is the term coined by Hugo de Vries.

• Mutation is referred to the sudden change in the sequence of bases in genetic material of organism.

• It can be point mutation or frameshift mutation.

• Sometimes mutation are harmful.

• Mutation can leads to variation and evolution.

Answer 2

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$\small\blue{\sf { Question :—}}$

Inbreeding depression is due to

(A) Mutation

(B) Vegetative propagation

(C) Cross pollination

(D) Self pollination

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$\small\red{\sf { Answer :- }}$

Self Pollination ✔

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$\small\pink{\sf { Explanation:—}}$

• We investigated the reproductive biology of the invasive tree Acacia dealbata in its introduced range in South Africa.

• In the study population, A. dealbata was at least partially self-compatible with a high capacity for autonomously selfing.

• However, strong inbreeding depression was evident in seed development, seedling growth and survival to 3 months.

• It is not yet clear whether selfing promotes invasion in A. dealbata

• This depends on whether reproductive assurance benefits outweigh the inbreeding depression costs of selfing.

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