Formation of ascopores in Neurospora
1st meiotic
division
Diploid meiocyte
2nd meiotic
division
mitosis
Mature ascus with 8
ascospores
Segregation of a gene for dark vs light spore colour
1st meiotic
division
Diploid meiocyte
2nd meiotic
division
mitosis
Mature ascus with 8
ascospores
Independent assortment of two genes in Neurospora.
Dark (D) vs Light (d), and smooth (S) vs rough (s). (this
1st meiotic
division
Diploid meiocyte
2nd meiotic
division
mitosis
Cross of parental lines DS x ds
Diagram shows ascus formation in the F1.
Mature ascus with
parental types
Independent assortment of two genes in Neurospora.
Dark (D) vs Light (d), and smooth (S) vs rough (s). (this
1st meiotic
division
Diploid meiocyte
2nd meiotic
division
mitosis
Cross of parental lines DS x ds
Diagram shows ascus formation in the F1.
Mature ascus with
recombinant types
Distribution of height from an F2 segregating
for two independently assorting genes with additive
effects on height.
2000
1000
0
Frequency
3000
Histogram of x
0
1
2
Height
x
3
4
CAPS polymorphism showing biparental inheritance of
chloroplast DNA. Adjacent pairs of lanes involve DNA
extraction from dark vs green patches showing unusual
biparental inheritance of chloroplast DNA
From Shore and Triassi (1998). American Journal of Botany 85:328-332.
Paternally biased cpDNA inheritance in Turnera ulmifolia (Turneraceae).
A pedigree showing and example of the inheritance of
a trait determined by a mutation in a mitochondrial
gene. Shows strict female transmission of the trait.