Part 3: crossing tail-feather length and feather color cross a p generation, llbb with llbb. assume the following f1 generation: llbb: 480 llbb: 20 llbb: 20 llbb: 480 (score for question 1: of 2 points) 1. which offspring are not the recombinant offspring in this cross?type your answer here. (score for question 2: of 2 points) 2. how far apart are l and b?type your answer here.

Q: 1.Which offspring are not the recombinant offspring in this cross?

It is mentioned in the question that we are crossing Tail-Feather Length and Feather Color with short feather length and recessive feather color organisms.

P1:                                           LlBb X llbb

Gametes:                              LB: Lb: lB: lb :      lb

Offspring:

So as we see that perntal combinations are LlBb  and llbb which means 480 + 480 organisms are just like parents while Llbb: 20  and llBb: 20  (20 +20=40) are recombinants.

It means that number of recombinants are 40.

Q2:  How far apart are L and B?

To answer this question we will use a formula:

The distance between L and B = Total number of recombinant types/  total number of offspring X 100

It means that distance between L and B=  40/1000 X 100

                                                                  = 4

It means L and B are 4 units apart because they make up 4 % of the total recombinant types. you just saw how we did it.

Hope it help! :)

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this