BIOLOGY HIGH SCHOOL

A person with blood group A produces antibodies againstb. A person with blood group B produces antibodies against
a. A person with blood group AB produces no antibodies. How can you explain this?

Answers

Answer 1
Answer:


This is simply a protective mechanism of the body. A person with blood group A will produced antibodies against  blood group B because  group B cells are considered foreign bodies to the person and will not be tolerated and vice versa. Group B people have antibodies against group A and will not tolerate group A cells. This is why group A person can only be transfused with group A blood or group O blood. Both A and B   have no antibodies against blood group O. Indeed no blood group has antibodies against Blood group and this  is why people with blood group O are called universal donors.

Group AB people do not have antibodies against any blood group because both these groups are part and parcel of their body and production of antibodies against either A or B would end up in self destruction of the body. Group AB  people are known as universal recipients because they can receive blood from any of the other groups.

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The northern red-legged frog, or Rana aurora, is found along the western coast from British Columbia to Northern California. Their typical breeding season lasts from January to March. The foothill yellow-legged frog, or Rana boylii, is found along the western coast from northern Oregon to central California. Their typical breeding season lasts from April to July. What mechanism might keep Rana aurora and Rana boylii from mating?A.)anatomical isolation B.)temporal isolation C.)geographic isolation D.)behavioral isolation
An apple contains ________ energy that your body can convert into other forms of energy. A) Chemical B) Thermal C) Nuclear D) Mechanical
According to Mendel's Law of Segregation, meiosis involves the separation of a parent organism's alleles in order to form gametes. Since the alleles separate into different gametes, only one allele passes from each parent on to an offspring. This segregation of alleles during meiosisa) increases the chance that an offspring will receive a dominant allele. B) decreases the chance that an offspring will receive a dominant allele. c) increases the genetic variability of the offspring. D) decreases the genetic variability of the offspring.
Some animals can strategize, assess their environment, and cooperate with others to obtain food. true?false?

Which describes a potential benefit for the environment that stems from genetic engineering?

Answers

Phytoremediation describes a potential benefit for the environment that stems from genetic engineering.Environmental pollution is a huge problem around the globe and this is resulting in global warming, which in turn is resulting in the increase of the ocean levels. This is the process by which the contamination of soils is reduced.

Answer:

The answer is C. Phytoremediation on e2020

Explanation:

You are looking at tissue under a microscope. One cell shows half the amount of DNA of some of the other cells. This cell is most likely to be in which phase of the cell cycle?G2
G1
M

Answers

i dont even know i will guess it is g1

The continents began to drift apart by the end of the _______ period. A. Permian
B. Neogene
C. Cambrian
D. Cretaceous

Answers

The correct answer is A. Permian.

This was 200 million years ago and at that time there was only one continent named Pangaea.

State the functions of the following PARTS OF AMNIOTIC EGG 1 Embryo 2 Shell 3 Shell membrane 4 Air sac 5 Albumen 6 Yolk 7 Yolk sac 8 Amnion 9 Chorion 10 Allantois

Answers

Answer:

1.Embryo is an underveloped form of the bird at its early state of development usually few weeks old like a week.

2.Shell acts as it's outer covering.

3. Shell memberance acts as a semipermeable memberance for substances to leave or enter the Shell.

4. Air Sac contains a means of respiration for the Embryo.

5. Albumen is the part of the egg reach in protein or the white part you see after cooking.

6. Yolk contains the nutrient

7. Yolk Sac contains yolk

8. Amnion acts as shock observer, liquid suspension of the embryo and as a waste absorber.

9. Chorion is the outer embryonic memberance.

10. Alantios is a memberance that contains blood vessels that feeds the embryo,

Explanation:

Refer to the answers memberance is usually a surface that is permeable to certain substances.

Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles. However, the child may have a sibling that does not have freckles. Which statement best describes the presence of freckles? 1.Freckles are not determined by DNA. 2.There are two alleles for freckles. 3.There is no dominant allele for freckles. 4.Freckles are determined by two genes instead of by one. If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible? 1.F1 generation 2.P generation 3.F1 generation and F2 generation 4.P generation and F2 generation.

Answers

Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles.

What is Freckles are determined of?

Freckles are determined by two genes instead of by one. If Mendel had crossed a true breeding dominant plant with a true breeding recessive plant, in which of the three generations is the recessive trait visible.

Freckles are not determined by DNA. There are two alleles for freckles. There is no dominant allele for freckles. Freckles are determined by two genes instead of by one. F1 generation .P generation, F1 generation and F2 generation, P generation and F2 generation.

Primase is an enzyme that synthesizes short RNA sequences called primers. These primers serve as a starting point for DNA synthesis during replication as the DNA polymerases cannot begin the synthesis of the new strand, they only extend it after primase begins it and primase produces RNA molecules, the enzyme can be said to be a type of RNA polymerase.

Therefore, Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles.

Learn more about genetic mutations on:

brainly.com/question/1282397

#SPJ6

Part 1.

The correct answer is option 2.There are two alleles for freckles.

According to the condition of the occurrence of the freckles, it can be concluded that the freckle is an autosomal dominant condition. The freckle can only be inherited, if there is at least one dominant allele in any of the parent. If both the individuals are heterozygous for the trait, they can produce an offspring without freckle by passing down the recessive alleles to the progeny. So, the freckles are controlled by two alleles, which can be either dominant or recessive.

Part 2.

The correct answer is option 4. P generation and F2 generation.

In this case, it is given that true bred homozygous recessive plant is crossed with true bred homozygous dominant plant. The true bred recessive plant always shows the recessive phenotype. When  true bred homozygous recessive plant is crossed with true bred homozygous dominant plant, the F1 generation would produce all the heterozygous individual and exhibit dominant phenotype. When the F1 generation is self crossed, it result in 75% dominant phenotype and 25% recessive phenotype.

A possible cross for this case is given in the picture.

Which list of details describes the viviparous mode of reproduction?A. internal fertilization, development of an embryo within the female body, and the developing embryo deriving nourishment from its mother
B. external fertilization and the development of offspring outside the mother's body
C. internal fertilization and the development of an embryo within the female body without nourishment from the mother

Answers

The answer is A. internal fertilization, development of an embryo within the female body, and the developing embryo deriving nourishment from its mother

There are three different modes of reproduction:
- Ovoparity - internal fertilization, but development of offspring outside the mother's body (in eggs: ovo
- Viviparity - internal fertilization, development of an embryo within the female body, and the developing embryo deriving nourishment from its mother
- Ovoviviparity - internal fertilization, development of an egg which remains in the mother's body before the hatch and lacks nourishment from its mother.
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