Answer:
the mariana trench is an example of a deep ocean canyon and it is formed by the fusion of sub-merging of the Eurasian plate and the Philippine Plate. Not all trenches are as deep as Mariana Islands. The descend part of the Marian is called Challenger Deep and it covers most of the southern part of trench.
Explanation:
Answer:
3.5%
Explanation:
The genes crossveinless and Stubble are linked and 7mu apart. That means that the frequency of recombination between them during meiosis will be 7%.
The alleles for crossveinless are:
- cv-c+ wildtype, dominant
- cv-c mutation, recessive
The alleles for Stubble are:
- Sb mutant, dominant
- Sb+ wildtype, recessive
A dihybrid female Drosophila with genotype cv-c Sb+/cv-c+Sb is testcrossed (crossed with a homozygous recessive male):
cv-c Sb+/cv-c+Sb X cv-c Sb+/ cv-c Sb+
<u>The male can only produce one type of gametes:</u> cv-c Sb+
<u>The female can produce 4 types of gametes:</u>
- cv-c Sb+ Parental, 46.5%
- cv-c+Sb Parental, 46.5%
- cv-c Sb Recombinant, 3.5%
- cv-c+Sb+ Recombinant, 3.5%
The frequency of recombination between cv-c and Sb is 7%, and 2 recombinant gametes are formed, so each of them will appear 3.5% of the times. The parental gametes will have a frequency of 100%-7%=93%, and there are 2 of them so each will have a frequency of 46.5%.
Only when the recombinant gamete cv-c+Sb+ joins the gamete generated by the male parent will the offspring be wild-type for both genes, so the proportion of phenotypically wild-type individuals in the progeny will be 3.5%.
