Twogenes,
a and b, are located 10 maps units fromeach
other. a third
gene,
c, is located 15 map units from b and 5 mapunits
from a. a parental
generation
consists of aabbcc and aabbccindividuals. the f1
are then test-
crossed to
aabbcc individuals. what percentage ofthe offspring would
you
expect to be
aabbcc?

5%

Explanation:

We have the following loci map:

The parental cross was between the individuals:

Each parental individual can produce only 1 type of gamete, so the F1 will be homogeneous with the genotype: CAb/caB.

The F1 are test crossed to cba/cba individuals.

The homozygous recessive can only produce cba gametes.

The F1 can produce 8 types of gametes:

The question is asking about the percentage of offspring that will have the genotype CAB/cab

The cab chromosome comes from the homozygous recessive individual with a probability of 1.

The CAB chromosome comes from the F1 individual, and was a result of crossing over between the genes A/a and B/b.

The formula to relate genetic distance with recombination frequency is:  

Genetic Distance (m.u.)= Recombination Frequency X 100.

In our problem, Genetic distance between A/a and B/b loci is 10 map units.

Therefore:

10 m.u. = (Recombination Frequency between A/a and B/b) x 100.

0.1 = Recombination Frequency between A/a and B/b

When crossing over happens between the A/a and B/b genes, both CAB and cab are generated, so each of them will appear in a frequency of half the total recombination frequency between those genes, to add a total of 0.1.

The gamete CAB will appear with a frequency of 0.05.

The gamete cab will appear with a frequency of 1.

The percentage of the offspring that will be CAB/cab is:

ysosomes are membrane-bound vesicles that contain digestive enzymes, such as glycosidases, proteases and sulfatases. lysosomal enzymes are synthesized in the endoplasmic reticulum (er), are transported to the golgi apparatus, and are tagged for lysosomes by the addition of mannose-6-phosphate label.

explanation:

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse