Lec 2. Mitosis & Meiosis Flashcards Preview

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Flashcards in Lec 2. Mitosis & Meiosis Deck (60)
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1

What is the ultimate source of genetic variation?

Mutation

2

Meiosis provides a mechanism to

recombine variants and increase variability

3

what is the fundamental unit of heredity?

Genes

4

Genes come in multiple forms called

alleles

5

True or false? Genetic info is only carried in DNA

False, it is carried in DNA & RNA

6

where are genes located?

chromosomes

7

When do chromosomes separate?

mitosis and meiosis

8

What is evolution?

Change in genetic frequency in a population over time

9

Do prokaryotic cells have a nucleus?

No

10

Do eukaryotic cells have a nucleus?

Yes

11

What is the cell diameter for prokaryotic cells?

small

12

What is the cell diameter for eukaryotic cells?

Large

13

What is the genome for prokaryotic cells?

one circular DNA molecule

14

What is the genome for eukaryotic cells?

multiple linear DNA molecules

15

What is the DNA in prokaryotic cells?

no histones in bacteria, some in archaea

16

What is the DNA in eukaryotic cells

complexed with histones

17

What is the amount of DNA in prokaryotic cells?

small

18

What is the amount of DNA in eukaryotic cells?

large

19

Do prokaryotic cells have membrane-bounded organelles?

No

20

Do eukaryotic cells have membrane-bounded organelles?

Yes

21

What are prokaryotes made up of?

eubacteria and archaea

22

True or False? Viruses are prokaryotic

False. Neither prokaryotic nor eukaryotic

23

what is one characteristic of Viruses?

Outer protein coat surrounds nucleic acid

24

True or False? Homologous chromosomes are similar but not identical

True.

25

How are homologous chromosomes similar but not identical?

Each homolog carries the same genes in same order, but the alleles for each trait may not be the same

26

What do diploid cells carry?

two sets of genetic info. Two sets of chromosomes

27

What do haploid cells carry?

one set of genetic info

28

How many pairs of chromosomes do humans have?

23 pairs

29

Define centromere

attachment point for spindle microtubules

30

Define telomeres

tips of linear chromosome