Science Quiz Topic 4 Lesson 2

Question 1

The series of events in which a cell grows, prepares for division, and divides to form daughter cells.

Answer 1

Cell Cycle

Question 2

How many chromosomes do humans typically have?

Answer 2

46

Question 3

Where are the instructions that every living thing needs to live located?

Answer 3

The genes

Question 4

How would you know whether an organism is homozygous or heterozygous for a certain trait by examining its chromosomes. (Check in #1)

Answer 4

They look at the code on the gene from each inherited chromosome. If each gene has identical codes, the individual is homozygous. If the genes have different codes, the individual is heterozygous.

Question 5

A tool that geneticists use to map out the inheritance of traits.

Answer 5

A pedigree

Question 6

Definition for Mitosis

Answer 6

When the cell’s nucleus divides into two identical copies of the parents cells, and genetic material is distributed into each daughter cell.

Question 7

Definition for Meiosis

Answer 7

type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell. Also the process in which sex cells are formed. These sex cells are not genetically identical.

Question 8

When sperms+eggs fuse they form a ______ or fertilized egg

Answer 8

Zygote

Question 9

A male crab has 104 chromosomes in a sperm cell. How many chromosomes do they have in each cell?

Answer 9

208

Question 10

How can crossing over lead to the expression of new traits (Homework #5)

Answer 10

They continue to exchange genetic material and as that happens variations become exceedingly probable.