Biology 1 Flashcards
meiosis
creation of sex cells
gametes
sperm or egg cells
homologous chromosomes
similar shape, size and genes
chromatin
a strand of dna, stringy like
homozygous chromosomes
have two of the same alleles for a trait
heterozygous chromosomes
two different alleles for a trait
alleles
alternative form or a version of a gene
prophase
chromosomes are visible
gene pool
all
combinations of alleles in a population
genetic diversity
gene flow into another generation through sexual reproduction and immigration
genetic drift
change in allele frequency in a population
quantitive observations
amount, measurements requiring tools, number based
qualitative observations
color, texture, smell, shape, relative size, and behavior; no measurements
inference
a conclusion made from previous knowledge
adaptations
anatomical features
adaptive value
adaptations that raise survival rates of a species
species
a group of organisms sharing common traits; able to interbreed.
food web
many connected food chains
food chain
a feeding relationship in an ecosystem; producer and consumer
dominant alleles
traits expressed in species
recessive alleles
traits not expressed
genotype
genetic trait of an individual
nucleus
a double bounded membrane organelle that stores DNA
DNA
genetic material inherited by living organisms
chromatid
a condensed and shortened form of DNA
chromosome
made of dna; sister chromatids held together by a center centromere
sister chromatids
two identical copies of the same chromosome
