Chapter 3: Heredity And Environment

Question 1

Each molecule of DNA is called a

Answer 1

Chromosome

Question 2

Chromosomes contain instructions to

Answer 2

Make all the proteins living being needs

Question 3

Complete packet of instructions is called a

Answer 3

Genome

Question 4

How many sets of chromosomes does a person have?

Answer 4

23 sets of chromosomes

Question 5

Human genome contains how many genes?

Answer 5

30,000

Question 6

Reproductive cell that directs process by which genetic information combined and transmitted

Answer 6

Gamete

Question 7

Father gametes

Answer 7

Sperm

Question 8

Mother gametes

Answer 8

Ovum

Question 9

Male and female gametes fuse and become a

Answer 9

Zygote

Question 10

What is a genotype

Answer 10

Genetic info from 46 chromosomes

Question 11

XX?

Answer 11

Female

Question 12

XY ?

Answer 12

Male

Question 13

Critical factor in determining sex of a zygote is

Answer 13

Which sperm reaches ovum first

Question 14

Monozygotic twins

Answer 14

Identical(quadruplets) twins originate from one zygote

Question 15

Dizygotic

Answer 15

Two separate zygotes

Question 16

Differentiation

Answer 16

Cells specialize

Question 17

Multifactoral traits

Answer 17

Inherited traits produced by interactions do genes and environment

Question 18

Polygenetic traits

Answer 18

Inherited traits produced by gene interaction

Question 19

Genetic imprinting

Answer 19

Tendency of certain genes to be expressed differently when inherited from mother than from father

Question 20

Phenotype

Answer 20

Actual appearance

Question 21

3 chromosomes at gene #21

Answer 21

Down syndrome (trisomy-21)