Stem cell research has been a controversial subject in past years. What is the reason for this?

The options

A. Cells for study are often taken from human embryos.

B. Stem cell techniques will not accomplish the intended purpose.

C. The cells cannot be isolated. 

D. Replacement tissue will never be grown from a person's own stem cells.

The CORRECT ANSWER IS A.

A. Cells for study are often taken from human embryos.

Explanation:

Even from the past, the use of stem cells in medical experimental findings has been controversial with lots of arguments. This is due to the fact that when the concept of the therapeutic use of stem cells first came to light in the late 1990s, scientists were obtaining human stem cells from embryos.

Embryos is well known to possess cells which are non-differentiated and maybe converted into any kind of cell in the body. It is argued that these cells would go a long way in creating new tissues for people with diseases or malformations conditions.

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).

i think that it is plants