They can be maintained in a gene pool if they are expressed before <span>reproductive age.</span>
For example: Sickle cell anemia is caused by an abnormal hemoglobin in red blood cells. hemoglobin is the red pigment found in red blood cells for carrying oxygen.The abnormality arises from a genetic mutation in the DNA gene that codes for the beta chain of the protein called globin of which hemoglobin is made of.In the beta chain, the sixth amino acid called glutamine is replaced by another one called valine.This one change in the amino acids cause the hemoglobin protein to behave abnormally, causing red blood cells to lose their normal spherical shape and become bent like a sickle, hence the name "sickle cell" anemia
Lethal alleles can be defined as the alleles that can cause organism's death having lethal alleles. This is because these alleles are resulted from mutations in genes, which are essential for proper growth and development.
Although lethal alleles are harmful, they can be maintained in gene pool if they express in an organism before his reproductive age as mutations can be passed from one generation to other if mutations are expressed in germline cells before reproduction.
Ovaries produce and release two groups of sex hormones—progesterone and estrogen. There are actually three major estrogens, known as estradiol, estrone, and estriol. These substances work together to promote the healthy development of female sex characteristics during puberty and to ensure fertility.
Kristi has a type b personality. The personality theory was develop in order to know the patterns of human behavior and to know the chances of developing coronary heart diseases. The type b personality usually are happy go lucky, do not get stressed and remain cheerful.
<span>Biome is the term for the physical amount of plant material at a location. But also it could be Biota. So It would better if you've attached any options to choose.</span>
This act was signed into law on August 6, 1965, by President Lyndon Johnson. It outlawed the discriminatory voting practices adopted in many southern states after the Civil War, including literacy tests as a prerequisite to voting.
