What would the results of Taylor's experiment be if eukaryotes used a conservative mode of DNA replication? A. After one round of replication in radioactive solution, one double-stranded DNA molecule would be radioactive in both strands and the other would not be radioactive in either strand.
B. After one round of replication in radioactive solution, two double-stranded DNA molecules would be radioactive in one strand and would not be radioactive in the other strand.
C. After one round of replication in radioactive solution, both double-stranded DNA molecules would be radioactive in both strands.
D. After one round of replication in radioactive solution, two double-stranded DNA molecules would contain no radioactivity in any strand.
E. After the second round of replication in nonradioactive solution, all four DNA molecules would be nonradioactive in both strands.
F. After the second round of replication in nonradioactive solution, two of the four DNA molecules would be radioactive in both strands and the other two DNA molecules would contain one radioactive strand and one nonradioactive strand.
G. After the second round of replication in nonradioactive solution, one of the four DNA molecules would be radioactive in both strands and the other three DNA molecules would contain no radioactivity in any strand.
H. After the second round of replication in nonradioactive solution, two of the four DNA molecules would be radioactive in both strands and the other two DNA molecules would be nonradioactive in both strands.

A. After one round of replication in radioactive solution, one double-stranded DNA molecule would be radioactive in both strands and the other would not be radioactive in either strand.

Explanation:

In 1960, Taylor showed that DNA replication in eukaryotic cells is semiconservative. During DNA replication, two DNA molecules are synthesized from the original template. Each one of these DNA molecules contains one strand of the original DNA molecule and one newly-synthesized strand. Taylor used for its experiment plant cells of Vicia faba replicated in the presence of 3H-thymidine. This radioactive isotope (3H-thymidine) releases beta-particles (electrons) and it was used to evidence the semiconservative mechanism by following the distribution of radioactive labeled DNA through a technique known as autoradiography.

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.