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3 years ago

Between 1960 and 2010 the concentration of co2 in the atmosphere increased by

1 answer:

5 0

Currently, humans are emitting around 29 billion tonnes of carbon dioxide<span> into the atmosphere per year. Around 43% remains in the atmosphere - this is called the 'airborne fraction'. The rest is absorbed by vegetation and the oceans. While there are questions over how much the airborne fraction is increasing, it is clear that the total amount of CO2 in the atmosphere is increasing dramatically. Current CO2 levels are the highest in 15 million years.</span>

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Mrs. Jones blood typing results showed agglutination with the plasma containing anti - B antibodies only. What is her blood type

MakcuM [25]

Answer:

Mrs Jones Blood type= B type.

Safe transfusion from: B and O blood type.

Explanation:

In the given example, the anti-B antibodies are present in the donor plasma. Since anti-B antibodies react with B antigen present on the RBCs of blood, Mrs. Jones should have B antigen on the surface of her RBCs. The blood type with only B-antigen on the RBC's surface is blood type "B".

Hence, her blood type is "B" type which has B antigens that react with anti B antibodies of the donor plasma causing agglutination and hemolysis of RBCs.

She can get the blood of B and O blood types. Blood type O is a universal blood type as it does not have B or A antigens on the surface of its RBCs to initiate the agglutination.

4 0

3 years ago

Suppose that one of the normal children from Part B and one of the albino children from Part C become the parents of eight offsp

Aleks [24]

Full question from alternative source:

Albinism in humans is inherited as a simple recessive trait. for the following families, determine the most likely genotypes of the parents

Part A

Two normal parents have five children, four normal and one albino. What are the most likely genotypes of the parents?

Part B

A normal male and an albino female have six children, all normal. What is the most likely genotypes of the parents?

Part C

A normal male and an albino female have six children, three normal and three albino. What are the most likely genotypes of the parents?

Part D

Suppose that one of the normal children from Part B and one of the albino children from Part C become the parents of 8 offspring. What would be the expected number of normal and albino offspring?

Answer:

Part A - both heterozygous for the trait (Aa)

Part B - female aa, male likely AA

Part C - female aa, male Aa

Part D - 4 normal, 4 albino (50:50)

Explanation:

Part A

We are told that albinism is a recessive trait. Lets call it a and the normal allele A. Since neither of the parents have it, that must mean they each possess at least one copy of the dominant allele (either AA or Aa). Most of their children are normal, but 1 is albino. The albino child must have inherited two copies of the a allele, one from each parent. This means each parent must possess an a allele and must both be Aa.

Part B

Since the trait is recessive, we already know that the albino female must have the genotype aa. If her husband in homozygous normal (AA), all their children will be heterozygous (Aa), and therefore normal, which is the case in this cross. Therefore aa and AA are the most likely genotypes. However, it is still possible that the male has the genotype Aa. This would mean they had a 50:50 chance of producing an albino offspring. We know they have six normal children, so this is unlikely.

Part C

Since the trait is recessive, we know the female has the genotype aa. Unlike the last family, this family has some albino children. This means that the husband must be a carrier of the trait, but he is unaffected, so must be Aa.

As described in part B, if he is Aa and she is aa, they will have 50:50 normal:albino children. This is the ratio in this family.

Part D

The normal children from Part B are all heterozygous for the trait (Aa), inheriting one normal allele from their father, and one albino allele from their mother. The albino children from part C are all aa. Therefore, the cross is Aa x aa. We can draw a punnett square:

A a

a Aa aa

aa a Aa aa

Half the children have the genotype Aa, and half have the genotype aa. That means half will be normal and half will be albino. Therefore, 4 normal, 4 albino.

4 0

3 years ago

In order to maintain a stable internal environment, the cells of all living organisms must be able to

xenn [34]

Answer:<em> Living organisms must maintain a constant internal environment while living in a constantly changing external environment. </em>

Explanation: Maintaining the internal environment is important because the processes that keep the cell alive can only take place under certain conditions. There are different processes that occur in the body to maintain the constant internal environment such as diffusion, osmosis, homeostasis, active transport, passive transport, endocytosis, exocytosis, etc. Homeostasis helps to maintain an equilibrium of an internal environment.

4 0

3 years ago

Read 2 more answers

During the light-independent reaction, carbon dioxide is fixed by adding it to a

LenaWriter [7]

Answer:D) 5-carbon compound

Explanation: During the light independent reactions, the first step in the cycle is carbon dioxide fixation in which three molecules of carbon dioxide is fixed into three molecules of a 5- carbon compound known as ribulose 1, 5- bisphosphate in a reaction catalyzed by ribulose 1, 5 -bisphosphate carboxylase (rubisco)

6 0

3 years ago

Disinfection using toilet bowl cleaner and nonionizing radiation to non-animate surfaces only removes or kills vegetative bacter

aleksandrvk [35]

The term that best describes this action is: Disinfection .

Disinfection is the process of cleaning in which there is removal of most pathogenic microorganisms on non-animate objects. Different disinfectants (chemicals such as alcohols, aldehydes and non-chemicals such as ultra violet lights) are used in disinfection. The disinfectants are classified according to their spectrum of activity (high, intermediate, and low level), consistency (liquid, gaseous), and their mechanism of action (some acts on membrane, some destroys the nucleic acids, and some work by denaturing cellular proteins).

8 0

3 years ago