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Chapter 11- Vocab
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27
Biology
9th Grade
01/26/2014

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Term
Genetics
Definition
Study of heredity
Term
Fertilization
Definition
In sexual reproduction the male and female reproductive cells join to form a new cell
Term
Trait
Definition
Specific characteristic of an individual
Term
Hybrid
Definition
Offspring of crosses between parents with different traits
Term
Gene
Definition
sequence of DNA that codes for a protein and thus determines a trait; factor that is passed from parent to offspring
Term
Allele
Definition
one of the different forms of a gene
Term
Principle of Dominance
Definition
Mende's second conclusion; some alleles are dominant and some are recessive
Term
Segregation
Definition
separation of alleles during gamete formation
Term
Gamete
Definition
sex cell
Term
Probability
Definition
likelihood that a particular event will occur
Term
Homozygous
Definition
having two identical alleles of a gene
Term
heterozygous
Definition
having two different alleles for a gene
Term
phenotype
Definition
physical characteristic
Term
genotype
Definition
genetic makeup
Term
punnett square
Definition
used to predict the genotype/phenotype combinations of a genetic cross
Term
independent assortment
Definition
One of Mendal's principles; genes for different traits can segregate independently during the formation of gametes
Term
Incomplete dominance
Definition
one allele is not completely dominant over another
Term
codominance
Definition
phenotypes produced by both alleles are completely expressed
Term
Multiple allele
Definition
a gene that has more than two alleles
Term
polygenic trait
Definition
trait controlled by two or more genes
Term
homologous
Definition
chromosomes where one set comes from the dad and one set comes from the mom
Term
diploid
Definition
a cell that contains two sets of homologous chromosomes
Term
haploid
Definition
a cell that contains only a single set of genes
Term
meiosis
Definition
process where the number of chromosomes per cell is cu in half through the separation of homologous chromosomes in a diploid cell
Term
tetrad
Definition
structure containing four chromatids that forms during meiosis
Term
crossing-over
Definition
process where homologous chromosomes exchange portions of their chromatids during meiosis
Term
zygote
Definition
fertilized egg
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