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11 Mendel
The Work of Gregeor Mendel
27
Biology
9th Grade
07/15/2009

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Term
genetics
Definition
the study of heredity
Term
fertilization
Definition
during sexual reproduction, male and female reproductive cells join which form a new cell that develops into a tiny embryo
Term
true-breeding
Definition
something that is allowed to self-pollinate and produce offspring identical to itself
Term
trait
Definition
specific characteristic, such as seed color or plant height
Term
hybrids
Definition
offspring of crosses between parents with different traits
Term
genes
Definition
the chemical factors that determine traits
Term
alleles
Definition
the different forms of a gene
Term
segregation
Definition
the separation of alleles
Term
gametes
Definition
sex cells
Term
probability
Definition
the likelihood that a particular event will occur
Term
punnett square
Definition
a diagram that can determine the gene combinations that might result from a genetic cross
Term
homozygous
Definition
organisms that have two identical alleles
Term
heterozygous
Definition
organisms that have different alleles for the same trait
Term
phenotype
Definition
physical characteristic of an organism
Term
genotype
Definition
genetic makeup of an organism
Term
independent assortment
Definition
when the alleles for a particular trait segregate independently
Term
incomplete dominance
Definition
cases in which one allele is not completely dominant over another
Term
codominance
Definition
cases in which both alleles contribute to the phenotype
Term
multiple alleles
Definition
genes that have more than two alleles
Term
polygenic traits
Definition
traits controlled by two or more genes
Term
homologous
Definition
two sets of chromosomes - each of the chromosomes from the male has a corresponding chromosome from the female
Term
diploid
Definition
a cell that contains both sets of homologous chromosomes (every cell in your body EXCEPT your sex cells)
Term
haploid
Definition
cells that only carry one set of genes - your sex cells
Term
meiosis
Definition
a process of reduction division in which the number of chromosomes per cell is cut in half through separation of homologous chromosomes in diploid cells - sex cell formation
Term
tetrad
Definition
a structure formed from when each chromosome pairs with its corresponding homologous chromosome - in meiosis 1
Term
crossing over
Definition
portions of chromatids exchange in this process which happens during tetrad formation
Term
gene map
Definition
a map showing the relative locations of each known gene on chromosomes
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