Life cycles

Question 1

The frequency of cell division depends on what?

Answer 1

Type of cell

Question 2

What drives the cell cycle?

Answer 2

Specific chemicals in the cytoplasm

Question 3

What is the cell cycle control system regulated by?

Answer 3

Both internal and external controls

Question 4

What is the most important checkpoint for most cells?

Answer 4

G1 checkpoint. If I cell passes the g1 checkpoint it will generally complete s, g2 and m phases and divide

Question 5

What is the g0 phase

Answer 5

When a cell hits the g1 checkpoint and does not get the go ahead it enters the g0 phase and does not continue with division

Question 6

What do stop and go signs do?

Answer 6

They are internal signals that delay anaphase

Question 7

What are some external signals that are growth factors?

Answer 7

Proteins release by certain cells that stimulate other cells to divide

Question 8

How are living organism distinguished?

Answer 8

Reproduce with their own kind

Question 9

What is genetics?

Answer 9

The scientific study of heredity and variation

Question 10

What is heredity?

Answer 10

The transmission of traits from one generation to the next

Question 11

What is variation

Answer 11

Variation is demonstrated by the differences in appearance that offspring show from parents and siblings

Question 12

People say offspring acquire physical traits from parents, what do they mean?

Answer 12

They acquire genes not physical traits

Question 13

Genes are pass through what to the next generation?

Answer 13

Reproductive cells called gametes

Question 14

What are genes?

Answer 14

The unit of heredity and are made up of segments of DNA

Question 15

What is a locus?

Answer 15

Specific location for gene on a chromosome

Question 16

What is asexual reproduction?

Answer 16

One parent reproduces genetically identically identical offspring by mitosis

Question 17

What is a clone?

Answer 17

Group of genetically identical individuals from the same parent

Question 18

What is sexual reproduction?

Answer 18

2 parent give rise to offspring that have uniques combination of genes from both parents

Question 19

What is a life cycle

Answer 19

The generation to generation sequence of stages in the reproductive history of an organism

Question 20

What is a karyotype

Answer 20

An ordered display of the pairs of chromosomes from a cell

Question 21

What are the 22 pairs of chromosomes that don’t determine sex called?

Answer 21

Autosomes

Question 22

What’s is a diploid cell? Haploid?

Answer 22

Cell with 2 sets of chromosomes

Call with 1 set of chromosomes

Question 23

What are the two chromosomes in each pair called?

Answer 23

Homologous chromosomes or homologs

Question 24

What does a gamete contain?

Answer 24

Single set of chromosomes and is haploid

Question 25

What is a zygote?

Answer 25

A fertilized egg

Question 26

What are the only cells in the human body made by meiosis?

Answer 26

Gametes, everything else is mitosis

Question 27

What do plants and some algae exhibit

Answer 27

An alternation of generations, this lifecycle includes both diploid and haploid multicellular stages

Question 28

What does the diploid organism called the sporophyte make?

Answer 28

Haploid spores by meiosis

Question 29

What is a gametophyte?

Answer 29

A haploid organism grown from a spore

Question 30

What does a gametophyte make?

Answer 30

Gametes by mitosis

Question 31

What is a diploid sporophyte the result of?

Answer 31

Fertilization of gametes

Question 32

What is the only diploid stage for fungi and Protists?

Answer 32

Zygote, then the zygote produces haploid cells by meiosis

Question 33

What is the only kind of cell that can divide by mieosis?

Answer 33

Diploid

Question 34

What does meiosis do too the number of chromosomes

Answer 34

Reduces number from diploid to haploid