Answer:
Some sweet-pea plants have purple flowers and other plants have white flowers. A homozygous variety of pea that has purple flowers is crossed with a homozygous variety that has white flowers. All the F1 have purple flowers. When these F1 are self-fertilized, the F2 appear in a ratio of 9/16 purple to 7/16 white. Show your work.
A) Give genotypes for the purple and white flowers in the F2 generation.
PP x ww= Pw, Pw, Pw, Pw F1 generation
Pw x Pw= PP. Pw, Pw and ww F2 generation
3 purple and 1 white flower
B) Draw a hypothetical biochemical pathway to explain the production of purple and white flowers in sweet peas.
Explanation:
Answer:
The statement is true
Explanation
the statement is wrong because the structure of DNA was discovered in 1953 by James Watson and Francis Crick and they explained it very well. till 1985 everything about the structure of DNA was very well known and the scientist knew that the DNA of each person differs from each other.
The correct answer is: B) The F1 variance is due only to environmental factors.
According to Mendelian genetics: he crossed two purebred parents with differing traits to be sure that there were no other factors contributing to the outcome of the cross. When two purebred parents are crossed, all of the offspring should be genetically the same (heterozygous).
In the example above, we can see that there is phenotypic variance among the offspring, so we can conclude that it must be due only to environmental factors.
The hardened exoskeleton keeps the body cooler and perspiration free which allows them to store water for long periods of time.
Answer:
Explanation:
Body waves are waves that moves within the earth. They propagate within the earth and have very interesting capabilities in different mediums.
There are two main types of body waves:
- Primary waves or P-waves; these types of waves can move within any material medium such as solid, liquid or gases. They are compressional waves in nature. They usually arrive in a seismic station first.
- Secondary waves or S-waves or Shear waves causes shearing. They move only in solids as liquids and gases cannot be sheared.
On a seismograph, wherever we cannot see an S-wave suggests that liquids or gases are present because they will not allow this wave to pass through.
Whenever we see P-waves, solids, liquids and gases are present.
This is a very important property used to investigate the subsurface.
