Chapter 15 Flashcards
(19 cards)
What were Mendels hereditary factors?
Genes
Where were Mendels hereditary factors located?
Chromosomes
What happens to homologous chromosomes during meiosis? How does this relate to the law of segregation?
The chromosomes separate and segregate this exactly what the law of segregation
Name three reasons to use fruit flies as a model organism for studying genetics
Prolific and fast breeders
Only four pairs of chromosomes
Different varieties
What does wild type mean?
The phenotype for a character most commonly observed in natural populations
What is the opposite of wild type?
Mutant
Morgan’s p generation
True bred parents
Morgan’s f1
Everyone is wild
Morgan’s f2
3:1 red to white
No white females
Why did Morgan get the particular result he got in his f2 generation?
The eye color gene is sex linked it is only present on the X chromosome not the y
Long
Female
Only eggs
X chromosome
Very short
Male
Sperm and eggs 50/50
Y chromosome
Female chromosomes
x and x
Male chromosomes
X and y
Did Mendel know what his “hereditary factors” actually were?
No
Do all animals use this same system of sex chromosomes?
No
On which chromosomes are nearly all human sex linked genes found
X
Three sex linked disorders found in humans
Duchenne muscular dystrophy
Hemophilia
Color blindness
Barr body
