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01.09.2020 •
Biology
Is auxin one of the most important group of plant hormones
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Ответ:
yes they are
Explanation:
because auxin are the most important hormones involved in adventitious root formation.
Ответ:
Yes!
Explanation:
Auxin is one of the MOST important group of plant hormones! They promote the growth that is needed for plants. They produce the stems and the buds, and the tips of the roots for the plants. Without it, things would go bad, and a lot of things would go awry.
I really hope I helped you with this question!
Ответ:
Answer and Explanation:
It is a dihybrid cross, where:
B= black (dominant)
b= brown
S= solid (dominant)
s= spotted
a) The genotype of the parents are:
homozygous black spotted= BBss ⇒ Gametes: Bs, Bs, bS, bS
homozygous brown solid= bbSS ⇒ Gametes: bs, bs, bs, bs
The F1 mice is the resultant progeny from the cross BBss x bbSS. We combine the games of the parents and all combinations are : BbSs. All F1 genotype is BbSs (heterozygous black and solid mice).
b) The testcross is carried out between F1 mice (BbSs) and brown spotted mice (bbss)
BsSs ⇒ Gametes: BS, Bs, bS, bs
bbss ⇒ Gametes: bs, bs, bs, bs
From the gametes, we obtain all the possible combinations:
BSbs = BbSs (black, solid) ⇒ ratio= 1/2 x 1/2= 1/4
Bsbs= Bbss (black, spotted) ⇒ ratio= 1/2 x 1/2= 1/4
bSbs= bbSs (brown solid) ⇒ ratio= 1/2 x 1/2= 1/4
bsbs= bbss (brown spotted) ⇒ ratio= 1/2 x 1/2= 1/4
So, we obtain 1/4 of black solid mice (BbSs), 1/4 of black spotted mice (Bbss), 1/4 of brown solid mice (bbSs) and 1/4 of brown spotted mice (bbss).