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jadenja712
21.11.2019 •
Computers and Technology
Which of the following statements about meta tags is true?
meta tags are a way of filtering items
online so that you only see the items
that connect to your interests.
meta tags are large amounts of data
that websites collect from their users.
meta tags are snippets of text that
describe the content of a page or
object
all of the above are true
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Ответ:
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).