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18 Cards in this Set

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  • Back
sexual selection
a form of natural selection in which organisms with certain inherited traits are more likely to be reproduced with
intrasexual selection
meaning selection within the same sex, individuals of one sex compete directly with other individuals to mate with the opposite sex
intersexual selection
mate choice, when individuals of one sex are choosy about who they mate with.
blending vs. particulate hypothesis of inheritance
the idea that genetic mate-rial contributed by the two parents mixes in a manner analogous to the way blue and yellow paints blend to make green vs. parents pass on discrete heritable units genes that retain their separate identities in offspring. An organisms collection of genes is more like a deck of cards than a pail of paint.
character
A heritable feature that varies among individuals, such as flower color,
trait
Each variant for a character, such as purple or white color for flowers,
true-breeding
For example, a plant with purple flowers is true- breeding if the seeds produced by self- pollination in successive generations all give rise to plants that also have purple flowers.
hybridization
mating, or crossing, of two true-breeding varieties
allele
alternative versions of a gene
law of segregation
the two alleles for a heritable character segregate ( separate) during gamete formation and end up in different gametes.
homozygous vs. heterozygous
An organism that has a pair of identical alleles for a character v. an organism that has a pair of different alleles for a character
phenotype
organism's observable traits
genotype
genetic makeup
testcross
Breeding an organism of unknown genotype with a recessive homozygote
law of independent assortment
each pair of alleles segregates independently of each other pair of alleles during gamete formation.
diploid
Having a pair of each type of chromosome, so that the basic chromosome number is doubled: diploid somatic cells
haploid
Having a single set of chromosomes
sister chromatids
two copies of the same chromosome