5-CHROMOSOMAL FUNCTIONS Flashcards
(15 cards)
The sex that produces identical gametes, such as XX in human females.
Homogametic Sex
The sex that produces different types of gametes, such as XY in human males.
Heterogametic Sex
A gene on the Y chromosome that triggers male development by initiating testes formation.
SRY Gene
A sex-determination system where females are XX and males are X0, found in insects like grasshoppers.
X0 System
Proposed by Calvin Bridges, suggests sex is determined by the ratio of X chromosomes to autosomes.
Genetic Balance Theory
A sex-determination system in Hymenoptera where unfertilized eggs develop into haploid males and fertilized eggs into diploid females.
Haplodiploidy
A sex-determination system where males are ZZ and females are ZW, seen in birds and some reptiles.
ZW System
A system where the incubation temperature of eggs determines the sex of offspring, found in reptiles like turtles and crocodiles.
Temperature-Dependent Sex Determination (TSD)
A form of asexual reproduction where females produce offspring without fertilization, seen in some reptiles and insects.
Parthenogenesis
Inheritance pattern for genes on the X chromosome, affecting traits like color blindness and hemophilia.
X-Linked Inheritance
Inheritance pattern for genes on the Y chromosome, passed from father to son.
Y-Linked Inheritance
A chemical produced by female marine worms that determines the sex of larvae.
Bonellin
The presence of both male and female reproductive organs in an organism.
Hermaphroditism
