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Unit A Ch. 2

reproduction and heredity

QuestionAnswer
mitosis the process by which a cell produces 2 new identical nuclei
cell division the dividing of a cell following mitosis
asexual reproduction reproduction by one parent
sexual reproduction reproduction by 2 parents
sex cell a type of cell produced only by an organism that reproduces sexually
meiosis the 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
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 (trait from appearing) of another gene
recessive gene a gene whose expression (Trait from appearing) is prevented by a dominant gene
purebred an organism with 2 dominant or 2 recessive genes for a trait
hybrid an organism with 1 dominant and 1 recessive gene for a trait
mutation a permanent change in DNA that occurs when DNA copies itself
Created by: lleahy
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