Question

will medal and fan for which kind of plant thats not a pea plant (Tall or short) do you know its genotype just by looking at the plant? and why?

Answer 1

Mendel determined that traits aren't blended but are
instead
passed on
,
intac
t
,
from parent to child. He found that everyone
got two genes for each trait
—
one from the mom and one from
the dad. Believe it or not,
at the time
it was a big deal to figure this
out.
He also concluded that some traits are dominant and some are
recess
ive. Dominant traits show up even if you also have a different gene for the same
trait
;
the gene that doesn’t show up
is
the recessive one
.
For example,
if you have a
gene for dimples in your cheeks and a gene for no dimples, you will have dimples
because
dimples are a dominant trait. The way you look
on the outside is called your
phenotype; t
he way you really are deep down in your genes is called your genotype.
One of the most amazing things Mendel discovered was
how traits appeared to skip a generation
. Mendel took a tall
pea plant and crossed it with a short one
. He expected
medium pea plants
,
but what he got was all tall pea
plants
!
Mendel then crossed these tall babies (he called them the
F1 generation) and he got three tall plants and one short
plan
t! What’s up with that? He used what is called a Punnett
Square to show what happened.
Originally
, we know o
ne parent is tall and its genotype is TT
(remember
, we’re talking about
what you look like in your
genes
,
and you have two alleles
, or gene option
s,
for each
trait)
, so we put those letters on one side of the square
. The
other parent is short and its genotype is tt
, so we put those
letters on the other side
.
Every baby
plant
gets an allele from each of them.
So w
hen
they have
four
pea babies, look w
hat happens!
Look carefully at the square. What do each of these pea babies look like? They're all tall
because
,
in peas, tall is dominant. Are they all truly tall deep down in their genotype?
No! They're half tall and half short, but the short doesn’t s
how on the outside
(their
phenotype)
.

Answer 2

okay thanks