Blended inheritance
In this type of inheritance, the offspring’s genetic material is portrayed as merely an average between the characteristics of their two parents, which are different. In complete dominance theory, the effects of the recessive allele are not completely masked by the dominant allele, and neither trait of the parents is dominant over the other, which brings about a phenotype which differs from both the recessive and dominant alleles, and the result appears to be a mixture of both the dominant and the recessive alleles.
In codominance, the alleles in heterozygote of a gene pair are fully expressed where an allele from each parent of the homozygote combines, which demonstrates both phenotypes in the offsprings. Therefore, the trait is neither recessive nor dominant.
Fertile progeny
This is where different organisms can mating naturally and produce viable, fertile offspring that come from cross-breeding different entities. A perfect fertile progeny is influenced by the fertilization process, gamete production, and the ability to carry a pregnancy. To start with, the fertilization process which occurs when the egg’s nucleus fuses with the nucleus of the sperm to form a zygote, which is a diploid cell. During the fertilization process, the sperm’s acrosome produces enzymes that enable it’s burrowing through the egg’s outer jelly coat. The plasma of the sperm fuses with the egg’s plasma membrane—the successful fusion of the egg and the sperm from a new organism.
Gamete production constitutes a perfect fertile progeny, where gametes are haploid cells that constitute a copy of chromosome per cell. The production of the reproductive cells occurs through mitosis. After that fertilization, a type of cell division called meiosis occurs, which reduces the parent’s number of chromosomes by half and forms four gamete cells. The produced cells then develop into an ova, which matures in the females’ ovaries or the sperm which matures in the males’ testes.
Lastly, a perfect fertile progeny constitutes the ability to carry the pregnancy; a woman can be unable to carry a pregnancy to a live birth, where she will be classified as having primary infertility, which can be caused by fallopian tubes blockage that results from surgery for an ectopic pregnancy, endometriosis, and pelvic inflammatory disease. It can also be caused by the uterus having physical problems, and lastly, it can be caused by the uterine fibroids, which are tissues and muscle clumps on the walls of the uterus non-cancerous. For one to be able to carry a healthy pregnancy, one must strive to have a healthier body by taking the prenatal daily, getting regular exercises, avoid smoking, avoid taking alcohol, example liquor, staying out of hot tubs and saunas, and avoiding the use of recreational or street drugs.
References
Rogers, A. R. (2015). Rate of Adaptive Evolution under Blending Inheritance. arXiv preprint arXiv:1504.00374.
Johnson, M. H. (2018). Essential reproduction. John Wiley & Sons.