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31 Cards in this Set

  • Front
  • Back
haploid
cell containing only one set of chromosomes
polygenetic inheritance
additive effect of 2 or more genes on a single chromosome
punnett square
model for establishing the probabilities of the results of a genetic cross
incomplete dominance
type of inheritance in which F1 hybrids have an appearance that is intermediate between phentotypes and parents
dihybrid cross
cross involving 2 pairs of traits
recessive
in a heterozygote- allele not expressed
meiosis
2 stage division found in only sexually reproducing organisms
pedigree
family tree showing how traits are passed from generation to generation
chromosome
long threadlike associations of genes found in the nuclei of all eukaryote cells
diploid
having a double set of genes and chromosomes (1 from each parent)
germ cells
cells that form the gametes after undergoing meiotic division "pre-sec cells"
2 gene crossing
genetic cross involving 2 genes
characteristic
specific part of a phenotype that can be inherited (horns)
sex chromosomes
chromosomes involved with the determination of sex
monohybrid cross
cross involving a single pair of contrasting traits (horns/no horns)
gametes
male/female sex cells that are usually the result of meiosis (cells that we drag)
gene
one of many discrete units of heredity info locate on the chromosomes and consisting of DNA (horns)
homozygous
having 2 identical alleles for a given trait (WW/ww)
genotype
genetic makeup of an organism
autosome
chromosomes not directly involved in determining sex
phentotype
detectable traits, both physical and chemical, of an organism
sex linked traits
traits that result from genes in sex chromosomes
DNA
deoxyribonucleic acid- genetic material of most organisms
fertilization
when sperm units with an egg
mutation
a change in the DNA that can be inherited
single gene cross
genetic cross that involves a single gene
randomness
occurance of events with no apparent pattern
heredity
transmition of genetic characters from parent to offspring
dominance
the phenotype expression of only one of two alleles in a heterozygote
trait
specific versions of a characteristic (plain/fancy tails)
allele
alternative forms of a gene