Answer:
Explanation:
1 Long term exposure to harmful genotoxic chemicals or ionizing radiation can cause changes in the base sequence of DNA.Chemicals might induce DNA mutations, such as polycyclic hydrocarbons (fumes found in oil stations, or smoke from a tobacco cigarette), intercalating agents such as Ethidium Bromide (carcinogen), but also radiations such as UV-radiation (C and T bases are most vulnerable and would bind to identical bases unstead of their
2 Genetic changes that are described as de novo (new) mutations can be either hereditary or somatic. In some cases, the mutation occurs in a person’s egg or sperm cell but is not present in any of the person’s other cells. In other cases, the mutation occurs in the fertilized egg shortly after the egg and sperm cells unite. (It is often impossible to tell exactly when a de novo mutation happened.) As the fertilized egg divides, each resulting cell in the growing embryo will have the mutation. De novo mutations may explain genetic disorders in which an affected child has a mutation in every cell in the body but the parents do not, and there is no family history of the disorder.
Somatic mutations that happen in a single cell early in embryonic development can lead to a situation called mosaicism. These genetic changes are not present in a parent’s egg or sperm cells, or in the fertilized egg, but happen a bit later when the embryo includes several cells. As all the cells divide during growth and development, cells that arise from the cell with the altered gene will have the mutation, while other cells will not. Depending on the mutation and how many cells are affected, mosaicism may or may not cause health problems.
Answer:
Durante el ciclo menstrual, uno de estos óvulos sale del ovario
Explanation:
Answer:
Law of segregation
Explanation:
Mendel's law of segregation states that alleles of a gene get separated into gametes during meiosis. He discovered this law when he crossed a homozygous tall plant with a homozygous short plant. He noticed that all the F1 offsprings were tall. He then self-crossed the F1 offsprings to produce a phenotypic ratio of 3:1 in the F2 generation.
In this test cross, a dominant plant with green pod was crossed with a homozygous recessive plant with yellow pods. This cross was conducted to determine the genotype of the dominant parent. The result showed that the parent is heterozygous (Gg) because a 1:1 phenotypic ratio was obtained i.e. 1 Green pod plant: 1 yellow pod Plant.
This illustrates what Mendel discovered in his law of segregation that each allele will get separated into the gametes. In this case of Gg plant, G and g alleles will get separated into gametes. Although the g allele was masked but it will get separated into gametes, which will fuse with another recessive gamete from the homozygous recessive parent (gg) to produce a homozygous recessive offspring.
The process is called ovulation
Answer:
pregnant women don't menstruate bc the blood is going to the child now
Explanation: