Topic 24 Flashcards
1
Q
What will happen to all individuals with lethal genes?
A
They will die before sexual maturity - embryonic, fetal, prenatal and postnatal lethality
2
Q
Lethal genes
A
Most are recessive; Lethal in homozygotes, heteros are carriers
3
Q
Sublethal condition
A
more than 50% die
4
Q
Sub vital condition
A
more than 50% will live but they will have defects
5
Q
Dominant lethal genes
A
Lethal White Foal Syndrome (LWFS) in American Paint Horses; Manx tails; Merle colour in dogs
6
Q
Manx tails
A
Homozygous for tailessness (MM) are born dead - lethal
7
Q
Merle colour in dogs
A
Subcital; 50% will live but will have defects; MM-subvital; Mm - merle colour
