Mitosis & Cell Cycle
what phase does the cell spend moat of its life in?
interphase
how many haploid daughter cells form at the end of meiosis ll?
4
what is the uncondensed form of DNA called?
chromatin
what is the phenotype?
physical traits of an organism
in a dihybrid cross with complete dominance, what is the F2 phenotypic ratio?
9:3:3:1
true or false: cytokinesis is part of mitosis.
false
during which phase of meiosis does crossing over occur?
prophase l
what connects sister chromatids together?
centromere
what is a homozygous genotype?
two identical alleles (FF or ff)
you want to determine whether a dominant bunny is NN or Nn. what do you cross it with?
a homozygous bunny (nn)
during which phase do sister chromatids get pulled apart?
anaphase
what phase of meiosis corresponds to Mendel's principle of segregation?
anaphase l
what do microtubules attach to on chromosomes?
kinetochores
a red flower x white flower -> pink flowers: what type of inheritance is this?
incomplete dominance
what does crossing over occur less when genes are close together?
they're linked and tend to be inherited together
during what phase do chromosomes replicate?
S phase
what happened in prophase l that increases genetic variation?
homologous chromosomes pair up and crossing over occurs
what structure organizes spindle fibers during mitosis?
blood type AB is an example of what inheritance pattern?
codominance
on a pedigree, why might a trait skip a generation and reappear?
it recessive; parents carried at least one dominant allele
put this in order: chromatin condenses -> chromosome line up -> sister chromatids separate -> nuclear envelope reforms
prophase -> metaphase -> anaphase -> telophase
what is one reason nondisjunction occurs
chromosomes fail to separate during meiosis
what are homologous chromosomes?
one chromosome from each parent carrying the same genes but possibly different alleles
why are X-linked recessive traits more common in males?
males only have one X chromosome
a snapdragon cross RR x RW produces what phenotype ratio?
1 red : 1 pink