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expeople1 [14]
3 years ago
7

The following scientists made significant contributions to our understanding of the structure and function of DNA. Place the sci

entists' names in the correct chronological order, starting with the first scientist(s) to make a contribution. I. Avery, McCarty, and MacLeod II. Griffith III. Hershey and Chase IV. Watson and Crick V. Chargaff
Biology
2 answers:
Ksivusya [100]3 years ago
8 0

Answer:

Griffith, Chargaff, Avery Mc Carty and MacLeod, Hershey and Chase, Watson  and Crick,

Explanation:

Avery, McCarty and MacLeod- their famous experiment, an experimental demonstration of DNA was presented in 1944

Griffith: born in 1877. In 1928 he reported his first observation of transforming principle in bacteria.

Hershey and Chase: They conducted series of experiments in 1952 to confirm that DNA is a genetic material

Watson and Crick: Crick was born in 1916 and Watson in 1928. Their discovery of DNA as double helix structure was made in 1953

Chargaff was born in 1905. He developed two rules that led to the discocery of DNA as double helix structure

Artemon [7]3 years ago
7 0

Answer: All of the mentioned Scientist made considerable contributions to understanding the DNA molecule in the order:

Explanation: 1.Fredrick Griffith

2. Avery, McCarty and MacLeod

3.Chargaff

4.Hershey and Chase

5.Watson and Crick

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Human blood types are characterized by the presence absence of surface markers known as a tigers on the surface of red blood cel
zalisa [80]

Answer:

characterized by presence or absence of antigens

the blood types are A, B, O, AB

Explanation:

There are two antigens and two antibodies that are mostly responsible for the ABO types.  The specific combination of these four components determines an individual's type in most cases. Erythrocytes and serum were related to the presence of antigens on these erythrocytes and antibodies in the serum. these antigens  are A and B, and depending upon which antigen the erythrocytes express, blood either belonged to blood group A or blood group B. A third blood group contained erythrocytes that reacted as if they lacked the properties of A and B, and this group was later called "O" blood group. The fourth blood group AB, was added to the ABO blood group system. These erythrocytes expressed both A and B antigens.

Blood group   Antigen present on RBC    Antibodies in serum    Genotype(s)

      A                        antigen A                             anti-B                     AA or AO

      B                        antigen B                             anti-A                     BB or BO

      AB              both A and B antigen                 none                         AB

      O                           none                           anti-A and anti-B           OO

4 0
3 years ago
Which of the following describes chaparral shrubs?. a.. short. b.. evergreen. c.. contain flammable oils. d.. all of the above
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D. all of the above

as they are all, evergreen, short and contain flammable oils
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2 years ago
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True or False: Cre/loxP technology can be used to selectively delete target genes in a specific cell type, or to tag a specific
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The answer is false
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which of the following explains why normal cells grown in a petri dish tend to stop growing once they covered the bottom of the
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Sorry if this is wrong but the answer should be D
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What is the probability that the first offspring from the cross listed below will be heterozygous for all loci?
Tanya [424]

Answer and Explanation:

<u>Cross:</u> aa Bb dd Ee x AA bb Dd Ee

We can calculate the probability of getting heterozygous individuals in the progeny by using the <u>product rule</u>. Assuming that these four genes <u>assort independently</u> (<em>events that occur independently from each other</em>), we can infer that the F1 will have the next genotypic proportions for each gene:

1) aa     x     AA

F1) 4/4=1 Aa

2) Bb    x    bb

F1) ½ bb

     ½ Bb

3) dd    x    Dd

F1) ½ dd

     ½ Dd

4) Ee    x    Ee

F1) ¼ EE

    2/4 = ½ Ee

     ¼ ee

So, to know what the probability is that the F1 of being heterozygous for all loci, we must multiply the respective individual probabilities of getting a heterozygous genotype, like this:  

1 Aa   x   ½ Bb   x    ½ Dd    x    ½ Ee = 1/8 AaBbDdEe

                                 

6 0
3 years ago
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