It is extremely labor intensive and costly. :-(
One of the reasons the plasma membrane can have<span> selective permeability</span><span> it's because it's composed by a bi-layer of phospholipids.
The interaction between them and other molecules will influence how these molecules will cross the membrane. If the molecule it's </span>hydrophobic it can easily cross, if it's polar molecules and ions( hydrophilic), they cannot cross easily.
Answer:
O Fruit fly gametes have 2 chromosomes while parent cells have 4 chromosomes.
Explanation:
The fruit fly is a diploid (2n) species with a chromosome number equal to 4, which means that somatic cells have two sets of homologous chromosomes, each set composed of two chromosomes (2n = 4). Moreover, fly gametes are haploid (n) cells, containing each a complete set of two non-homologous chromosomes (i.e., half the amount of DNA compared to parent cells). During meiosis, a single cell divides twice following one complete round of DNA replication, producing thus four gametes with a haploid number of chromosomes.
Requirements for folate increase by 50 % during pregnancy, Folate plays a vital role in the production of red blood cells and helps the fetus neural tube to develop into her brain and the spinal cord. Pregnant women are advised to increase folate in their diet as folate is important in that it helps to prevent neural tube and other birth defects. Tube defects are serious birth defects of the spinal cord such as spina bifida and the brain such as anencephaly.
The method of self-announcement is frequently done IN SMALL TOWNS.