Lect. 7 - Cleavage II Flashcards Preview

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Flashcards in Lect. 7 - Cleavage II Deck (16):
1

genomic imprinting

differential gene expression depending on whether a chromosome is inherited from the male or female parent. Refers to the observation that expression of certain genes derived from the egg differs form the same genes derived from sperm

2

methylation and imprinting relationship

additon of methyl groups to a DNA molecule can inactivate the entire or parts of specific genes

3

Prader Willi syndrome

small hands and feet/short statures etc. Mutation always inherited from FATHER - (deletion in long arm of chromosome 15)

4

Angelman Syndrome

laughter/uncontrolled muscle movement; Mutation is always inherited from MOTHER - (deletion in long arm of chromosome 15)``

5

What is the purpose of X inactivation?

dosage compensation, or preservation of the cells form an exess of X chromosomal gene products

6

What brings about X inactivation

the action of Xist

7

Xist

located on X chromosome; produces an RNA molecule that coats the X chromosome and induces X inactivation

8

Barr bodies

inactive X chromosome that should have been inactivated

9

regulation

ability of an embryo to compensate for removal of structures or for addition of structures

10

dizygotic

twins from 2 fertilized eggs

11

monozygotic

twins from 1 fertilized egg

12

cephalopagus

head to head fusion

13

pyppagus

rump to rump fusion

14

cephalothoracopagus

fusion involving head and thorax

15

thoracopagus

chest to chest fusion

16

bateson's rule

mirror image