class 15 sex and gender- sex determination teacher notes Flashcards Preview

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Flashcards in class 15 sex and gender- sex determination teacher notes Deck (24):
1

hermaphrodites

individuals can produce both male and female gametes

2

perfect flowers

flowers with both male and female parts

3

diocious

individual plant produces only male or female flowers

4

environmentla sex determination

abiotic or biotic factors

5

abiotic factor

temerature dependent sex detmerination

6

biotic factor

effect of presecnese/absence of males on sex determination

7

genetic sex determination

chromosomal sex determination; sex chromosomes

8

males are the

heterogametic sex

9

females are the

homogametic sex

10

sry

sex determining region on Y

11

Barr body

inactivated X chromosomes

12

dosage comepnsation

leads to situation that females are actually mosaics with regards to genes on X chromosome

13

sex linkage

linkage of specific phenotypic traits with sex of individual

14

anisogamy

presence within a pop of different types of differently sized gametes in contrast to isogamy

15

isogamy

where agametes are all the same

16

disruptive selection

early stages of evolution of sexual reproduction- selection for gametes of diff sizes- mobile and resource rich gametes

17

females prodcue

macrogametes

18

males produce

microgametes

19

genetic disarmement

eukaroyotic generally contain multiple genomes

20

nuclear genome

found in nucleus

21

genomes of some cellular organelles

mitochondria

22

sexual selection

type of natural selection that favors traits may impair survival of sexual individuals but enhances the bearer's reproductive success, explains many cases of sexual dimorphism

23

intersexual selection

female choice

24

intrasexual selection

male male competition

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