Dihybrid cross refers to a cross between the two distinct groups, which vary in two observed traits. For the genes on different chromosomes, each of the allelic pair demonstrated independent segregation.
If the initial filial generation generates four similar offspring, the latter filial generation, which takes place by crossing the members of the initial filial generation, demonstrates phenotypic ratio of 9:3:3:1.
Therefore, dividing the 80 progeny on the basis of the ratio 9:3:3:1, one can anticipate five snails to be homozygous recessive for both the traits. The calculation is to be done on the basis of the ratios and proportions, that is, the sum of ratio numbers 9+3+3+1 = 16.
80*1/16 = 5
In order to support the hypothesis that mutations occur in response to an environmental challenge, the experiment in question would have to show an increase in mutation rates shortly after the environmental challenge was introduced.
When we test a hypothesis, we perform an experiment and gather data over the course of the testing. In order to obtain evidence that supports a hypothesis, we have to ensure that only one variable is changing and be sure to repeat the experiment to confirm the values measured.
Taking this into account, a hypothetical result of the fluctuation test that would support the hypothesis of mutations in reaction to environmental challenges would be to measure a spike in mutation rates in the generation following an environmental challenge, and then continue to do so with future post-challenge generations.
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Cystic fibroses is an autosomal recessive disease
It's from the Hawaiian language and means the words "shiny, glassy surface, and smooth". The type of lava you want to know is Pahoehoe lava. Lava tubes are usually floored with it.
Hope this helps! :-)