meiosis and medel Flashcards
where is a point where non sider chromatids have undergone genetic change
when does this occur
this can be thought of as the ____ ___ where chromosomes cross over
chiasma
prophase 1
specific point
what forms when crossing over occurs
when does this happen
bivalent
prophase 1
the ____ holds a bivalent together where crossing over can then occur
chiasma
when does a reduction of ploidy occur and why does this happen (compared to mitosis)
anaphase 1
because there was no “s” phase. What you started with was not doubled before division
what is the formula for different genotypes
what is this called
2^n, with n being the number of chromosomes
independent assortment
how do you get meiotic recombination
what essentially is this
crossing over
creating a new genotype
what is the idea that there is a preformed mini person inside of an egg
what is this mini person Called
what is the main issue
preformatinism
humonculous
only comes from one parent
what is the idea that particles carrying info from various parts of the body to the reproductive organs
what is “use and disuse” in this context
what is the example used
pangenesis
Lamarckism
giraffe stretches neck and body info passes to kid so it has a longer neck
what is blended inheritance
what is the problem with this
that traits are mixed and become forever changed
desirable traits get diluted over time
model organisms
ease of ___
rapid _____
___ size
large brood size aka ___
___ are available and easy to verify
brood ___ available
cultivation
reproduction
small
fecund
mutants
literature
monohybrid: _____ trait
what does it mean when you switch the sex of a certain genotype of parents
what does it mean when ^ yield identical results
single
reciprocal cross
autosomal inheritance
what is another term for homozygous
true breeding
mendels explanation:
what is responsible for contrasting phenotypic differences
genes come in ___ called ____
what does halving genes pair in
what is mendels first law
_____ fertilization
genes (not coined till later, called factors)
paits, alleles
gametes
equal segregation
random
what does equal segregation mean
____
if you switch the sex of the parents but leave the genes the same and you get two different outcomes, what type of ingeritence are you dealing with
if theyre the same?
sex chromosome inheritance
autosomal inheritance
