BIOLOGY HIGH SCHOOL

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

Answers

Answer 1
Answer:

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
Answer 2
Answer:

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

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Answers

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Answers

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Hemophilia is a sex–linked disorder that is caused by a defective gene on the X chromosome. What will be the pattern of inheritance of the offspring of a hemophiliac father? A. The father passes the gene to all his sons but to none of his daughters. B. The father passes the gene to all his daughters but to none of his sons. C. The father passes the gene to all his daughters and all his sons.

Answers

"The father passes the gene to all his daughters but to none of his sons" is the one among the following that will be the pattern of inheritance of the offspring of a hemophiliac father. The correct option among all the options that are given in the question is the second option or option "B". I hope it helps you.

Answer:

Option (C).

Explanation:

Sex linked disorder may be defined as the disorders that are caused by the mutation or defects in the sex chromosome. Two main types of sex linked disorder are sex linked recessive and sex linked dominant.

Hemophilia is caused due to the defect in the clotting factor. This is a sex linked recessive disorder that are transferred from female to their sons. The hemophilic father has only one X chromosome and they will transfer this affected X chromosome to their daughters and none of their sons. Since, sons receive Y chromosome from their father.  

Thus, the correct answer is option (C).
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