18 terms

LIFE SCIENCE CHAPTER 10 Vocabulary

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Nitrogen bases
Molecules that contain nitrogen and other elements
DNA Replication
Before a cell divides, The process in which DNA copies itself
Heredity
The passing of traits from parents to off spring
Genetics
The scientific study of heredity
Fertilization
The process in sexual reproduction in which an egg cell and a sperm cell join to form a new egg
Purebred
An offspring of many generations that have the same form of a trait
Alleles
The different forms of a gene
Dominant Allele
An allele whose trait always shows up in the organism when the allele is present
Recessive Allele
An allele that is hidden whenever the dominant allele is present
Hybrid
An offspring of crosses that has two different alleles for a trait
Probability
A number that describes how likely it is that a particular event will happen
Punnett Square
A chart that shows all the possible combinations of alleles that can result from a genetic cross
Pedigree
A chart that shows the presence or absence of a trait according to the relationships within a family across several generations
Phenotype
An organism;s physical appearance, or visible traits
Genotype
An organism's genetic makeup, or allele combinations
Homozygous
Having two identical alleles for a particular gene
Heterozygous
Having two different alleles for a particular gene
Meiosis
The process that occurs in the formation of sex cells (sperm and egg) by which the number of chromosomes is reduced by half