SEX DETERMINATION Flashcards
1
Q
Angiosperms (2)
A
- hermaphrodite
- make both pollens and ovules
2
Q
Monoecious plants
A
- seperate male and female flowers
3
Q
Dioecious plants
A
- seperate male and female plants
4
Q
Types of sex determination (6 + pnemonic)
A
- Temperature
- Sequential hermaphroditism (stacks, males at top females at bottom)
- Availability (if no females, males become female)
- Hierarchy (if dominant female dies, dominant male becomes female)
- Ploidy level (diploid = female, haploid = male)
- Chromosome structure (XX = female, XY = male)
T S A H P C
Tall silly anteaters have poor claws
5
Q
karyotype
A
arranging chromosomes in descending size
6
Q
autosomes
A
the 22 chromosome pairs with identical genes
7
Q
heterosomes
A
the differing sex chromosomes
8
Q
pseudoautosomal regions (2)
A
- the two homologous regions on the X and Y
- reflect loss of genes from Y
