1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zielflug [23.3K]
3 years ago
12

In Drosophila melanogaster the recessive alleles for brown and scarlet eyes (of two independent genes) produce a novel phenotype

so that bw/bw;st/st is white. If a pure-breeding brown is crossed to a pure-breeding scarlet, what proportion of the F2 will be white
Biology
1 answer:
o-na [289]3 years ago
6 0
HEHEHEHEHEHEHEHDHDHHDHD
You might be interested in
Which image is an example of a rod-shaped colony of bacteria?<br>lam​
Luda [366]

Answer: The last one

Explanation:

3 0
3 years ago
Read 2 more answers
Which is NOT an immune component that can directly attack &amp; destroy target cells?
lara31 [8.8K]

Answer:

Macrophages are part of your innate immune system, which is antigen-independent and does not require activation.

Explanation:

Macrophages phagocytize (internalize) all non-self pathogens it encounters. These do their job without activation. Other cells in the innate immune system include basophils, neutrophils, eosinophils (these cells are polymorphonuclear leukocytes), mast cells, and dendritic cells, which act as the bridge between your innate and adaptive immune system.

All of the other entities listed above are part of your adaptive immune system. The adaptive immune system is antigen-dependent and requires activation. This section of your immune system responds differently to different pathogens, and has the bonus of having immunologic memory, the ability to remember pathogens after infection and respond much quicker upon secondary and tertiary encounters.

Note: All lymphocyte types begin as naïve cells, which then differentiate into their fully matured form upon activation.

Helper T cells are a type of CD4+ T cell that has the job of activating B and T lymphocytes. There are two different types of T helper cells: Th1 and Th2. Th1 cells secrete the cytokine interferon-gamma (IFNγ), and is primarily involved with the stimulation and activation of cytotoxic T cells, while Th2 cells secrete a variety of cytokines and are responsible for activating and assisting with B cells to make antibodies. To make a long story short, Th cells interact with APC (Antigen Presenting Cells), specifically their Class II MHC (a group of genes that present exogenous proteins). The Th cells then proliferate and gain the ability to activate these APC cells and provide the necessary signals to activate B and T cells and make them proliferate and do their specific function.

7 0
3 years ago
Individuals, as well as industry—and automobile manufacturers in particular have an obligation to work to reduce carbon dioxide
Novay_Z [31]
Agree because we need to look ahead into the future. We may have a normal life with not much negative effects but the future generations to come will. Plants will die causing animals to die with them. Good will become scarce and oxygen in the atmosphere will decrease.
6 0
2 years ago
If an atom has twelve electrons, how many electrons are in the n=1 energy level? how many electrons are in the n=2 energy level?
Serjik [45]

Magnesium has 12 electrons.........which wud mean that in the 1st energy level(n=1) there r 2 electrons, in the 2nd energy level(n=2) there r 8 electrons and in the 3rd energy level(n=3) there r 2 electrons.......its simple......use the formula 2n^2 where n= 1,2,3,......  

so the electron configuration of Magnesium in 2,8,2..................or more precisely 1s2, 2s2, 2p6, 3s2

8 0
3 years ago
It would gain nutrients from the water in the environment.
bulgar [2K]

Answer:

True?

Explanation:

5 0
2 years ago
Other questions:
  • Which structure is found in the cytoplasm of a prokaryotic cell, but is not found in the cytoplasm of a eukaryotic cell
    16·2 answers
  • The table below shows the precipitation in four locations:
    13·1 answer
  • If a mutation creates a new fur color in a wolf population, what factor might determine whether the frequency of the new trait w
    12·1 answer
  • Which of the following does not occur during interphase?
    5·1 answer
  • Saddle joints have concave and convex surfaces. Name the two bones of the hand that articulate to form a saddle joint. A. The tr
    6·1 answer
  • The number of protons in an atom determines the a. compound b. molecule or c. element?
    7·1 answer
  • Which of the following does not occur in telophase?
    13·1 answer
  • What would happen to the size of the mountain<br> lion population if the deer population increased?
    8·1 answer
  • Fossils of Glossopteris, an extinct fern, were discovered on which continents to support the theory of continental drift? Check
    9·1 answer
  • frebel, h., richter, k. and oxenius, a., how chronic viral infections impact on antigen-specific t-cell responses. eur. j. immun
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!