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4 years ago

When a population has a gene with two alleles circulating, how many possible genotypes are there?

1 answer:

5 0

Its so simple. Two alleles means three genotypes.
consider a gene has two alleles A(blue eyes) and a(brown eyes)
possible combinations:
1. AA - Homozygous dominant -Blue eyes.
2. Aa - Heterozygous - Blue eyes.
3. aa - Homozygous recessive - Brown eyes.

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As a country progresses from the preindustrial stage to the postindustrial stage, what will happen to the birth rate and death r

AnnZ [28]

Answer:Both birth rate and death rate will decrease.

Explanation:

Demographic transition: The process whereby a country moves from high birth and death rates to relatively low birth and death rates.

The decline in death rate is due to better economic and social conditions of the country which leads to control of pre-existing diseases, better medical facilities,more food production,increased jobs,better sanitation and hence better quality of life.

Decline in birth rate is due to improved quality of life and also could be due to availability of family planning services in highly developed countries.Moreover access to education especially in female population has created awareness regarding birth control.

4 0

3 years ago

CAN SOMEONE HELP ME PLASE ITS URGENT !!!

kolbaska11 [484]

F. The title has the words “MAKE YOUR GARDEN GROW” and f is the only answer that mentions a plants reproductive tissue which makes a plant grow.

7 0

3 years ago

Budding cells formed by saccharomyces are

Stolb23 [73]

Answer:

Budding cells formed by the Saccharomyces are through "Cytokinensis"

Explanation:

Cytokinensis helps the budding cells of the Saccharomyces to get splitted over two new cells. These buds raise, throughout its cell cycle and afterwards leaves its mother cell while mitosis been completed. Budding of the yeast makes up an perfect model for the creature to study the meiosis. Diploid yeast can be prepared by making it undergo through meiosis in absence of nitrogen which will lead to the generation of an ascus along with 4 haploid cells. Due to this the property of the meiotic products can also be studied.

5 0

4 years ago

What is the fossil record?

Maurinko [17]

History of life documented by fossils

7 0

4 years ago

Read 2 more answers

(a) Identify the most likely mode of transport across the membrane for substance L. Explain how information provided helps deter

Viefleur [7K]

Active transport occurs against the electrochemical gradient. It needs energy to move molecules from the lower concentration side to the higher concentration side. The mode of transport is active transport. 

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There are three main different types of transport across the membrane

Simple diffusion ⇒ Does not need energy to occur
Facilitated transport ⇒ Does not need energy to occur
Active transport ⇒ Needs energy to occur

Active transport is the transport of molecules that move against the electrochemical gradient, so it does need energy to happen.

Molecules move from the lower concentration side to the higher concentration side of the membrane.

Carrier proteins are in charge of active transport. The needed energy might proceed from the ATP molecules or the membrane's electric potential.

In the exposed example, a scientist wants to determine how substance L enters a cells in a culture.

The cells maintain a 120 mM intracellular concentration of substance L.

Varying external concentrations of substance L (10 to 100 mM) in culture medium (Table 1).

Table 1. Rate of entry of substance L into mammalian cells in culture

External concentration of substance(mM) Rate of entry of substance L

10 5%

20 25%

30 45%

40 65%

50 80%

60 90%

70 95%

80 100%

90 100%

100 100%

Now, we need to identify the most likely mode of transport across the membrane for substance L, and explain how information provided helps determine the most likely mode of transport.

We know that the intracellular concentration is 120mM.

As we can see, this concentration exceeds all of the culture media concentrations. Yet, the substance keep moving into the cell.

As the concentration inside the cell is always higher than the concentration outside, we can assume that this is not passive transport because the molecule transport is going against its concentration gradient.

Hence, the remaining option is active transport. And as said before, we can see it because the substance keeps crossing the membrane toward the cell interior despite its concentration being higher in the interior of the cell than in the exterior.

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6 0

3 years ago