![theman300045](/avatars/10863.jpg)
theman300045
22.01.2020 •
History
What does the us government regulate
Solved
Show answers
More tips
- C Computers and Internet How to Choose a Monitor?...
- S Style and Beauty How to Get Rid of Peeling Nails: Natural Remedies...
- S Science and Technology Understanding Magnetic Storms: A Guide to This Natural Phenomenon...
- F Family and Home What is Most Important in Men s Lives?...
- G Goods and services Which TV is better - LCD or Plasma?...
- C Computers and Internet Are there special gaming mice?...
- G Goods and services LED-подсветка в LCD-телевизорах: 5 причин, почему она лучше других технологий...
- C Computers and Internet Keep Your Mouse Pad Clean: The Right Way to Clean It?...
- C Computers and Internet 3D Glasses! What is this thing?...
- C Computers and Internet How to Reinstall Windows: A Detailed Guide for Beginners...
Answers on questions: History
- H History The january 13, 2002 issue of the new york times reported that there were 547,867 foreign students enrolled at us colleges and universities in 2000-01 representing a...
- H History 25 ! select the sentence in which the character advances the plot. the twins were wandering on the prairie not far from their log cabin. as had been true for weeks,...
- H History Quick will give 5 star, and use an encyclopedia, the internet, or other sources to research the slave codes and write a 500 word report. do not limit yourself to the...
- H History What was the impact of the differences between hutus and tutsis in rwanda in the 1990s?...
- H History How did economic motivations create international rivalries between imperial powers?...
- H History What was economic effect of Roman conquest?...
- H History What were the colonial responses to the Proclamation of 1763, the Stamp Act, and the Intolerable Acts, as seen in actions of the Sons and Daughters of Liberty and the...
- H History French Bentory Bishertory Spanish territory New Orleans (1718) What was the primary reason for the expansion of France s territory from Canada to New Orleans? they established...
- H History The Columbian Exchange was a transfer of people, goods, and ideas between . the Eastern and Western hemispheres Asia and the Americas Africa and the Americas the Northern...
- H History According to the map, the borders of the mongol empire...
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).