Human cells

Question 1

describe how embryo develops and leads to the formation of a human

Answer 1

fertilization
is the formation of a diploid zygote from a haploid egg and sperm
followed by cleavage, a period of rapid mitotic division without growth

Question 2

Name the three germ layers and explain what they are

Answer 2

ectoderm = epidermis of skin, the nervous system including the brain and sensory organs
mesoderm = the skeleton, muscles, blood vessels, heart, blood, kidneys
endoderm = lining of internal organs, including those of the digestive system, respiratory system, liver and pancreas

Question 3

what are the 4 different types of adult tissues and what are their uses

Answer 3

Epithelial tissue = tightly packed cells, covers internal and external surfaces
Connective tissue = loosely packed cells, surrounded by abundant extracellular matrix
Muscle tissue = specialized for movement
Nerve tissue = transmission of the nerve impulses

Question 4

what are the two main types of stem cells
A. embryonic
B. adult stem cell
C. germ-line
D. animal

Answer 4

A,B

Question 5

what is Totipotent, Pluripotent, Multipotent

Answer 5

T = each cell can develop into a new indivdual
P= cells can form any (over 200) cell types
M= cells that are differentiated and can form a number of other tissues

Question 6

what is nuclear transplantation used for

Answer 6

cloning method