Answer:
Spermiogenesis
Explanation:
Spermiogenesis is the stage during which the haploid spermatids are matured into sperms. It does not include any cell division.
The process of spermiogenesis includes elongation of spermatids and formation of acrosome at the top of its nucleus. A flagellum develops to make it a motile cell. There is an increase in the number of mitochondria while the excess of the cytoplasm is released outside.
All these events mature the haploid spermatid into a sperm cell having the capacity to reach and fertilize the egg.
Answer:
(i) An allele is a variant of a gene, can either be short or tall.
Dominant = the tall allele that "trumps" the short allele. if a dominant and recessive allele is present (heterozygous) then the dominant phenotype will be shown.
(ii) David's eyes are Brown
(iii) Sarah's eyes are blue
(iv) David - B, b
Sarah - b, b
(v) Possible genotypes include Bb and bb. These give the phenotypes of brown eyes or blue eyes.
(vi) The chance for blue eyes is 50% (or 1:1 ratio)
Answer:
I would agree more with Amos' opinion, thinking that most of the plant's energy ends up in the grasshopper.
Explanation:
In food chains, the flow of energy that occurs from one organism to another, from the producer to the tertiary or quaternary consumer. The amount of energy that can be transferred from one level to another is only 10%, with herbivorous animals taking up more of the energy that a producer has.
According to this, <em>it is logical to think like Amos, since the grasshopper -a primary or herbivorous consumer- will take advantage of more energy contained in the plant, with respect to the consumers of the higher levels</em>.
Learn more:
Energy and nutrients in an ecosystem brainly.com/question/8101088
Answer: The correct answer is-
B. by mutating their DNA in response to environmental conditions to gain beneficial traits.
Antibiotic resistance in bacteria means the bacteria is not susceptible to the antibiotic that is the effectiveness of antibiotic against the bacteria is eliminated or reduced.
It occurs when bacteria undergoes mutation that is alteration in the genetic material ( for instance, in one mechanism of resistance, mutation changes the protein that was earlier target for the antibiotic).
Therefore, by mutating the DNA in response to environmental condition ( such as exposure to antibiotic in this condition), bacteria gains beneficial characters and become resistant.
Thus, option B) is the right answer.
Answer:
Hypersensitivity is also known as intolerance which is defines as an unwanted reactions due to changes or interference with immune system for example allergies and autoimmunity. Hypersensitivity is the reaction of immune system that can be harmful and weakens once body.
Allergy is kind of hypersensitive reaction which is having fast response within few minutes rather than hours or days. In the case of allergies free antigens cross link with IgE on mast cells and basophils and releases vasoactive biomolecules. Few example of Allergies are anaphylaxis and asthma.
Autoimmune disorders are also a kind of hypersensitive reaction which occurs when body's immune system attacks own body cells mistakenly. few examples are Type 1 diabetes, Rheumatoid arthritis (RA), and Multiple sclerosis.
