BIO2242 – Lecture 16
What is sexual reproduction:
Those gametes come from different individuals.
Getting genetic contribution from mother and father for the offspring.
Gametes need to be at the same place at the same time = needed for fertilization
It alters the genetic material in the offspring so its not identical to their parents.
Get the parent dividing its chromosomes = segregation.
Crossing over occurs = where some material from paternal chromosome crosses
over to the maternal side, and vice versa. So theres mixing between the two.
Forms of sexual reproduction:
gonochoristic = male and female functions by separate individuals
Hermaphroditic = both roles played by same individual.
sequential = since from one role to another.
Internal and external fertilization IS NOT the types of sexual reproduction
XX = female
XY = male
genotypic sex determination = where genetic material determines whether
you’re male/female = occur mainly in vertebrates
Environmental sex determination = where some aspect of external environment
contributes to whether you’re male/female (temperature). The temp at which
the eggs were incubated at determines the sex of the offspring.
Involved the fusion of haploid gametes to form a diploid zygote
Is always achieved through internal fertilisation
Always involve gametes of the same size
Always involves crossing over
Why have sexual reproduction:
Process of meiosis, and process of crossing over which produces the genetic
Have to p