<span>Selective breeding (also called artificial selection) is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits (characteristics) by choosing which typically animal or plant males and females will sexually reproduce and have offspring together. (Domesticated) animals are known as breeds, normally bred by a professional breeder, while domesticated plants are known as (varieties), cultigens, or cultivars. Two purebred animals of different breeds produce a (crossbreed). Flowers, vegetables and fruit-trees may be bred by amateurs and commercial or non-commercial professionals: major crops are usually the provenance of the professionals. </span>
Answer:
The pollen grain which contains 3 haploid nuclei (2 sperm nuclei and 1 tube nucleus) for the male and the carpels which carry the ovary containing the ovule which further undergoes meiosis to produce an ovum/haploid egg cell for the females.
Explanation:
During fertilization,one of the two sperm nuclei inside the pollen tube fertilizes the ovum to form the embryo/seed. The second sperm nucleus fertilizes the diploid pollar nucleus to form the triploid (3n) endosperm. This is known as "double fertilization" which occurs only in angiosperms and not in gymnosperms.
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Answer:
Scientists have determined that Earth and the moon most likely could not have formed together when the solar system was created. If they had, the moon would have a large iron core like Earth's, but it instead has a small iron core.
Explanation:
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Answer:
when vesicles cluster at the future plane of division
Explanation:
Cytokinesis is the process whereby the cytoplasm of a cell divides into two. This process of cytokinesis occurs after nuclear division i.e. division of the nucleus. However, cytokinesis differs in plant and animal cells.
In plant cells, the separation of the cytoplasm involves the formation of a cell plate. The process begins when a structure called phragmoplasts carry vesicles to the cell plate. In other words, vesicles cluster at the future plane of division (cell plate).