Two genes are 22 map units apart on the same chromosome. a true-breeding gghh individual is crossed to a true-breeding gghh individual. the f1 offspring are mated to gghh individuals. if this testcross produces 1000 offspring, how many of them would you expect to be gghh?
select one:
a. 390
b. 250
c. 220
d. 110

d. 110

Explanation:

Parental cross: Gh/Gh  x  gH/gH

F1: Gh/gH

The following test cross experiment is done:

Gh/gH  x  gh/gh

Gametes produced by these individuals:

- gh/gh: gh (probability of 1)

- Gh/gH:

The formula that relates genetic distance with recombination frequency is:

In this problem:

22 m.u. / 100 = Recombination Frequency

0.22 = Recombination Frequency

The recombination frequency altogether is 0.22, but there are 2 possible types of recombinant gametes and when one is generated, the other one is generated as well. Therefore, each recombinant gamete has a frequency of half the total recombination frequency: 0.11

In an offspring of 1000 individuals, I would expect 110 to be GH/gh.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.