Hemophilia is a genetic disorder that inherited by X-linked recessive pattern. A daughter needs 2 genes to have the disease(or 1 gene to become carrier) but a son only needs to get 1 defect genes from his mother(X gene in male must come from mother). If Xh defected gene and X normal genes, the <span>punnett square </span>would be:
Father(XY)
X Y
Mother Xh XhX XhY ------>XhX= carrier , XhY= sick
(Xh X) X XX XY ------>healthy
Answer:
Arthropods invaded land about 100 million years before vertebrates. This fact most clearly implies that a. arthropods have had more time to co-evolve with land plants than have vertebrates
Explanation:
Arthropods are invertebrates animals. Its evolutionary ancestry dates back to the Cambrian period and they have had more time to co-evolve with land plants than have vertebrates. The vertebrates share a common ancestor. Scientists believe that the last common ancestor of all arthropods is a modular organism with each module covered by its own sclerite.
Answer: Most are unicellular Are 10 times larger
Has Ribosomes
Nucleoid Region containing
DNA
Most are multi-cellular Has a cell membrane
Has Membrane-bound
Organelles
Bacteria
Has DNA Has a nucleus
Animal cells and fungal cells Cytoplasm and organelles
“PROKARYOTIC CELLS” No membrane-bound
Organelles
No nucleus
“EUKARYOTIC CELLS”
Explanation:
Answer:
A negative feedback initiated by the external simuli or the products of a reaction aims to reduce the products/ output of the reaction. Hence In negative feedback the stimulus is reduced. An example of a negative feedback would be if a person had an elevated body temperature, the homeostatic response would be to lower the body temperature.
The correct answer is - nitrogen and phosphorus.
The nitrogen and the phosphorus are the two substances that cause most of the eutrophication. It is good for the organisms that live in the water when these two substances are available as they are very important nutrients, but if the optimal amount is surpassed than it can be devastating. When there's high quantities of nitrogen and phosphorus in the water it makes it much more rich in nutrients that it should be. That kind of situation is the best for the algae, which start growing all over the place, quickly covering the water and becoming the dominant life form. As that happens, the organisms that use photosynthesis will die out because the Sun will be blocked, and the algae will also contribute to a big reduction of the oxygen in the water too. The end result being totally destroyed ecosystem that has been overtaken by algae.
