Question

What is meant by genetic variation and what are factors that contribute to genetic variation?

What is the difference between benign tumor and malignant tumor?

What are the stages (know correct sequence) of mitosis?

What is the sex chromosome combination that determines male and female gender?

What does the cell theory say?

Answer 1

Q1).Answer:

Genetic variations mean change in DNA sequence of gene, which results other than parental character in progeny. There are several factors that cause genetic variations.

1. Mutations: These are changes in the DNA either at gene level or chromosome level. A single mutation can have a large effect
2. Gene flow: It is any movement of genes from one population to another and is an important source of genetic variation.
3. Mating patterns: Inbreeding or outbreeding
4. Genetic drift
5. Migration

Q2). Answer:

Two types of tumors.

Benign tumor: It does not invade its surrounding tissue or spread throughout the body.

Malignant tumor: It may invade its surrounding tissue or spread throughout the body. It travels along vessels, which called as metastasis.

Q3). Answer:

Mitosis is the process in which one cell becomes into two cells without any change.

a.      Prophase

b.      Metaphase

c.       Anaphase

d.      Telophase

Q4).Answer:

Male: XY

Female: XX

Q5). Answer:

Cell theory says….

a.      Cell is the basic structural and functional unit of organism

b.      Cells are produced from preexisting cells