Answer:
Explanation:
Gametes are sex cells, such as the egg and sperm. They are used in sexual reproduction to produce offspring.
The sex cells are produced during meiosis. The DNA or genetic material is replicated, then the cells divide twice. After this, four haploid cells are produced with <u>half of the genetic material</u>. For example, human body cells have 46 chromosomes but sex cells have 23 chromosomes.
They contain half the genetic material for an important reason. During fertilization, an egg and a sperm fuse. Each one contributes half of the genetic material from the mother or father to create one complete set for the offspring.
Gametes have <u>half the number of chromosomes in body cells</u> and <u>choice A </u> is correct.
If predators eat too many keystone species, it can lead to the ecosystem becoming unstable (Option B). A keystone species helps to define an entire ecosystem.
Keystone species are species that maintain the homeostasis (stable state) of the ecosystem.
In consequence, the lack of these species in an ecosystem would change it or cease to exist altogether.
An example of a keystone species is the jaguar that feeds herbivorous species capable of decimating plants in an ecosystem.
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Answer:
Bound complement components, especially bound C3b and its inactive fragments, are recognized by specific complement receptors on phagocytic cells
DNA technology is being used to help diagnoses genetic diseases
He first step in solving this problem requires an examination of the possible genotypes of the parents. As stated color-blindness is a recessive linked trait. So the genotypes of the parents should be:
<span>mother's genotype (normal vision but whose father was color blind) XNXn</span>
She is a carrier because of her heterozygous condition. For the recessive gene to be expressed one must be homozygous for it.
<span>father's genotype (color blind) XnY</span>
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