Development of the embryo begins at stage 1 when sperm fertilizes an oocyte and together they form a zygote. Human development begins after the union of male and female gametes or germ cells during a process known as fertilization (Conception).
Answer:
Answer is A. not produce the protein being studied.
Explanation:
The process of generating, creating or replicating a copy of a cell or an organism, which is genetically identical , is called cloning.
There are three types of cloning, these are
1. gene cloning... which is the process of replicating copies of genes.
2. reproductive cloning is the process of generating copies of whole organism.
3. therapeutic cloning... this process is always used when the aim is at creating or generating tissues in replacing diseased or injured tissue by producing embryonic stem cells for experiment.
Answer:
Option B, It was made in stars that lived before the solar system formed.
Explanation:
Almost all the carbon that exists today with in the living organisms was produced in the stars. When these stars exploded during the big bang theory all the carbon within hem was introduced in the environment of earth some billions of years ago. Hence , though carbon introduced in earth’s environment was due to big bang, its origin is from the stars. Hence option B is the correct answer
Cyanobacteria is responsible for generation of oxygen on planet earth and thus option D is in correct.
Answer:
Mother
Explanation:
The mutation needs two X chromosomes. Only the mother has two X chromosomes (XX). The father is male, so he only has one X chromosome (XY)
