Science unit 1 review Flashcards
(23 cards)
What are the components of cell theory?
All living things are made of cells, cells are the basic unit of life, and all cells come from pre-existing cells.
what happens during the metaphase of mitosis?
Chromosomes align t the metaphase plate.
What is the main purpose of mitosis?
To grow and repair the body.
What type of asexual reproduction has a parent growing an extra piece on it’s body and having it fall off>
Budding.
What type of reproduction has unfertilized eggs hatching?
Parthenogenesis
What is fragmentation?
fragmentation is when a piece of an organism is cut off or separated somehow, and the cut off piece grows into a new individual.
What is a somatic cell?
A cell that is part of our body, and not involved in gamete production.
When does crossing over occur?
Prophase 1.
What is the purpose of meiosis?
To make gametes or SEX cells.
What is the result of a Nondisjunction in meiosis?
A chromosomal disorder, or DEATH
Which structure produces sperm?
The testes.
What is the function of the epididymis?
To store and mature sperm.
Where does fertilization occur?
The oviducts?
Which structure is responsible for producing eggs?
The ovaries.
Where does SEX hormone production begin in both males and females?
The hypothalamus.
What is the term for different variations of the same gene?
Alleles.
What does genotype represent?
The genetic makeup of an organism?
What marks the start of the first trimester?
Implantation of the blastocyst in the uterus, or morning sickness.
What develops first in the embyro?
nervous system (poor little guy is nervous)
The heart begins to beat in which trimester?
trimester 1
what is the main event of trimester 2?
skeleton starts to develop?
what is the main focus of fetal development in trimester 3?
Growth and prepping for birth.
