Chapter 21 Flashcards

1
Q

Pseudogenes

A

Former genes that have accumulated MUTATIONS and are nonfunctional

they are not expressed

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2
Q

Repetitive DNA

A

present in multiple copies of the genome

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3
Q

Transposable elements

A

Move from one site to another in a cell’s DNA

Transposons and retrotransposons

Present in Eukaryotes and prokaryotes

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4
Q

Transposon

A

Move by means of a DNA intermediate

Require a transposase enzyme

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5
Q

Retrotransposons

A

Move by means of RNA intermediate

Use reverse transcriptase

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6
Q

Alu elements

A

Large portion of transposable elements

found in primates

Represent the result of transposition

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7
Q

What do many Alu elements code for?

A

RNA

can help regulate gene expression

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8
Q

Simple sequence DNA

A

contains many copies of tandemly repeated short sequences

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9
Q

Short Tandem Repeat (STR)

A

series of repeating 2-5 nucleotides

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10
Q

Multigene families

A

Collections of identical or very similar genes

Often code for rRNA

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11
Q

a-globins and b-globins

A

Non-identical multigene families

can be coded at different times for hemoglobin

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12
Q

Polyploidy

A

Extra sets of chromosomes

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13
Q

Lysozyme

A

Duplicated and evolved into the gene that encodes a-lactalbumin in mammals

Helps with milk production

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14
Q

Exon shuffling

A

contributed to genome evolution

rearranges exons

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15
Q

What happens if you insert transposable elements within a protein-coding sequence?

A

Could block protein production

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16
Q

What happens if you insert transposable elements within a regulatory sequence?

A

Increase or decrease protein production

17
Q

Highly conserved genes

A

Change little over time

18
Q

Evo-devo

A

The study of the evolution of developmental processes in multicellular organisms

19
Q

Homeobox

A

Code for a domain that allows a protein to bind to DNA and function as a transcription regulator

highly conserved

20
Q

What percentage of the genome is estimated to contain functional elements?

21
Q

Why is it harder to sequence eukaryotes than prokaryotes?

A

Eukaryotes have more noncoding sequences

Introns and other shit

22
Q

Example of nonindentical genes

A

Hemoglobin

Fetal and adult are different

23
Q

Difference between STRs and transposable elements

A

STRs are clustered one after the other

Transposable elements are scattered throughout the genome

24
Q

What can mutations create?

A
  1. Pseudogene
  2. Gene with new function
  3. Gene family with distinct but related members
25
Homeotic genes
Selectively expressed as the organism develops
26
Homologous genes in different species
Means they descended from a common ancestor
27
Evidence that we share common evolutionary history with Neanderthals
Small number of modern homo sapiens have Neanderthal sequences (lexie's cousin)
28
Homeotic genes
Encode transcription factors that control the expression of genes responsible for specific anatomical structures
29
Genomic hot spots
Areas that have the most disease, mutate the most, most often correspond with chromsomal breakpoints (3)
30
Why is it unwise to try to relate an organism's complexity with its size or number of cells?
Single celled organism still has to conduct complex life functions like the large celled organism
31
How do multigene families arise?
Duplication