24 terms

Terms	Definitions
Mendel studied these	pea plants
homozygous dominant	having two dominant genes for a trait, TT or BB
heterozygous	having two different genes for a trait, Bb or Tt
homozygous recessive	having two recessive genes for a trait, bb or tt
thymine	pairs with Adenine in DNA
cytosine	pairs with Guanine in DNA
uracil	RNA has this nitrogen base, DNA does not
meiosis	Cell division that produces gametes
gamete	a reproductive cell; it has 1/2 the chromosomes of a body cell. An egg or a sperm
XX	chromosome combination for a female
XY	chromosome combination for a male
46	the number of chromosomes in a normal human
heredity	the passing of traits to offspring by the parents
genetics	the study of heredity
incomplete dominance	allelles from both parents are blended, like RW (pink flowers)
codominance	both alleles of a gene show, like a chicken with black and white feathers
gender	the sex of a person or organism
sex-linked traits	traits controlled by the sex chromosomes
DNA	Deoxyribonucleic acid
sperm	a male gamete
egg	a female gamete
asexual reproduction	process by which a single parent reproduces by itself
mutation	change in a DNA sequence that affects genetic information. In order to be passed down it has to be present in a sex cell.
genetic disorder	An abnormal condition that a person inherits through genes or chromosomes. Can be a result of two many chromosomes or a missing or mutated chromosome.

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