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Advantages:
1. Hybrid vigour is maitained, 2. Chances of aquiring broad genetic base are always there. 3. Process of evolution continues.
Dis-advantages:
1. Seed formation always depend on availability of pollinator
2. Lots of variability leades to heterozygocity and inconsistancy in phenotypes.
3. Mixing of inferior genes takes place if pollinators are not controlled.
What else can I help you with?
Can a flower plant have more than one kind of pollination?
No, a flower plant typically has one specific type of pollination method. The method can be either self-pollination or cross-pollination, but a flower is not capable of having multiple types of pollination simultaneously.
Why is cross-pollination less likely to happen in a bottle than an outdoor garden?
Cross-pollination is less likely to occur in a bottle than in an outdoor garden primarily due to the limited space and restricted airflow in a bottle, which reduces the movement of pollinators like bees and wind. In an outdoor garden, a diverse array of flowering plants attracts various pollinators and allows for greater interaction between different plant species. Additionally, the controlled environment of a bottle may limit the presence of multiple plant types that could cross-pollinate.
In Gymnosperms Male cones usually occur on higher branches and farther from the trunk than the female cones Why would this be?
When pollen from the male cones is released it either falls to the ground by gravity or is dispersed by wind or light breezes. Having the male cone above the female ensures that some pollen will drop onto the female cone via gravity; if the female were above the male no pollen would be able to reach the cone - more a mechanism to ensure self pollination if cross pollination fails. By having the male cones at the our edge of the tree canopy it also improves the pollens chance of being lifted by wind and deposited on a nearby tree (for cross pollination)
Do potatoes need pollination?
No, potatoes do not require pollination. They are grown from seed potatoes, which are pieces of a mature potato that contain the necessary genetic material for new plants to grow. Potatoes reproduce asexually through this method rather than relying on pollination for seed production.
How is barley pollinated?
Barley is wind pollinated. The male parts of the flower produce a pollen that is blown off by the wind and this then sticks to the female parts of the flower as the breeze blows past them. As with most wind pollinated plants, huge amounts of pollen are produced and breathing this can cause certain people to develop hay fever in the spring/summer.
Why is cross pollination better than self pollinating?
it increases genetic diversity, which improves survivorship of the species
Why is cross-pollination of plants better than self-fertilization?
I have heard they are more disease resistant but I can't say for certain.
Why is self pollination better than cross pollination?
Cross pollination results in hybrid seed formation. Hybrids in general are vigorous than self pollinated plants due to additive gene action.
Can a flower plant have more than one kind of pollination?
No, a flower plant typically has one specific type of pollination method. The method can be either self-pollination or cross-pollination, but a flower is not capable of having multiple types of pollination simultaneously.
Compare the self pollination and cross pollination?
Self pollination-The transfer of pollen from a male reproductive structure (an anther or male cone) to a female reproductive structure (a stigma or female cone) of the same plant or of the same flower.Self-pollination tends to decrease the genetic diversity (increase the number of homozygous individuals) in a population, and is much less common than cross-fertilization. Many species of plants have evolved mechanisms to promote cross-pollination and avoid self-pollination, though certain plants, such as the pea, regularly self-pollinate.Cross pollination-The transfer of pollen from the male reproductive organ (an anther or a male cone) of one plant to the female reproductive organ (a stigma or a female cone) of another plant.Most plants reproduce by cross-pollination, which increases the genetic diversity of a population (increases the number of heterozygous individuals). Mechanisms that promote cross-pollination include having male flowers on one plant and female flowers on another, having pollen mature before the stigmas on the same plant are chemically receptive to being pollinated, and having anatomical arrangements (such as stigmas that are taller than anthers) that make self-pollination less likely. Insects and wind are the main agents of cross-pollination.
Does a flower need a bee even if it can self-pollinate itself?
Generally speaking cross-pollination (moving pollen from the flower of one plant to the flower of another plant) is considered better than self-pollination. Continual self-pollination of plants results in inbreeding (although sometimes a good thing) and very little genetic divergance. This means that populations of inbred plants are less likily to be able to adapt to climatic or environmental change than those which have a large gene pool.
Why is the stigma a different height than the anthers?
The stigma is typically positioned at a different height than the anthers to minimize the chances of self-pollination. By having the stigma situated higher or lower than the anthers, it reduces the likelihood of pollen from the same flower fertilizing the ovules, promoting outcrossing and genetic diversity. This separation helps increase the chances of pollination by pollen from a different plant, enhancing genetic variability in the species.
Does cross-pollinated flowers usually have their stamens higher than their pistils?
Yes, in most cases, in cross-pollinated flowers, the stamens are positioned above the pistil to prevent self-pollination. This arrangement encourages pollen from another flower to come in contact with the pistil for fertilization.
Why do plant species need to promote cross-fertilization rather than self-fertilizationWhy do plant species need to promote cross-fertilization rather than self-fertilization?
Cross fertilization leads to genetic variability which helps in the process of better adaptability and evolution
Can pollination in pea plants happen in three ways?
Pea flowers are self-pollinating. About two days before the flower even opens, the anthers at the top of the stamen, which are the male part, burst and release the pollen. This sticks onto the stigma and fertilizes the ovary - these are the female parts. In many flowering plants, the stigma will not accept pollen from the same plant and fertilization must occur through other means, such as insect pollination after the flower opens. For gardeners, self-pollination is an advantage as it means more than one type of pea can be grown close together, as cross-pollination will not occur.
Differentiate cross pollination from self pollination?
Self pollination is where the plant is able to pollinate without another plant. This provides much less variation in the genetics of the species from generation to generation than cross pollination which is where the pollen from one plant is carried to another plant (bees usually do this) and fertilizes the other plant. It creates more genetic diversity because the genes from both plants, which are different, are involved in the forming of the seed, not just the genes from the one self-pollinating plant.--------------------------------------------IMPROVEDSelf pollination is the transfer of pollen from the anther to the stigma of the same flower, another flower on the same plant, or the flower of a plant of the same clone. Cross pollination is the transfer of pollen from the flower of one plant to the flower of a plant having a different genetic constitution.
Why do hybrids that were developed from cross-pollination adapt more to environmental condition than their parent plants?
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