Ch 8: Reproduction & Heredity

Created by kariathey 

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19 terms

mitosis

the process by which a cell produces two new identical nuclei

cell division

the dividing of a cell following mitosis

asexual reproduction

reproduction by one parent and offspring are genetically identical to the parent

sexual reproduction

reproduction by two parents

sex cell

a type of cell produced only by an organism that reproduces sexually

meiosis

process by which sex cells form

fertilization

the joining of an egg cell and a sperm cell during sexual reproduction

zygote

the first cell of an offspring, formed when an egg cell and a sperm cell join

trait

a characteristic of an organism

DNA

the molecule in each cell that directs the cell's activities

gene

a section of DNA on a chromosome that controls a trait

base

one kind of molecule that makes up a DNA strand

heredity

the process by which traits are passed from parents to offspring

inherit

to receive from one's mother or father

dominant gene

a gene that prevents the expression of another gene

recessive gene

a gene whose expression is prevented by a dominant gene

purebred

an organism with two dominant or two recessive genes for a trait

hybrid

an organism with one dominant and one recessive gene for a trait

mutation

a permanent change in DNA that occurs when DNA copies itself

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