Lesson 2

Question 1

The idea that nature selects or allows to survive or reproduce

Answer 1

Principle of natural selection

Question 2

Size of the pinhead and it is the beginning of human

Answer 2

Zygote

Question 3

Thread like structures located in the nucleus of the cell

Answer 3

Chromosome

Question 4

Segment of DNA

Answer 4

Gene

Question 5

Cell division

Answer 5

Meiosis

Question 6

Usual process of cell division

Answer 6

Mitosis

Question 7

Genetic uniqueness of children of the same parent is even greater than this because of quirk called

Answer 7

Crossing over

Question 8

One fertilized ovum divides to form 2 or more genetically identical individuals

Answer 8

Identical twin or monozygotic twins

Question 9

2 eggs are involved result when 2 ova are release at approximately at the same time

Answer 9

Fraternal twins or dizygotic twins

Question 10

22 choromosomes called

Answer 10

Autosomes

Question 11

Last 1 pair of chromosomes (23)

Answer 11

Sex chromosomes

Question 12

Also known as trisomy 21 because it is associated with 3 rather than 2 21st chromosomes

Answer 12

Down syndrome

Question 13

An extra X chromosome causes physical abnormalities

Answer 13

Klinefelter syndrome (XX)

Question 14

An abnormality of X chromosome can cause intellectual disability, learning disabilities or short attention span

Answer 14

Turner syndrome (XO)

Question 15

An extra Y chromosome can cause above average height

Answer 15

XYY syndrome