In the sweet pea crossing experiment by Bateson and Punnet, the F2 generation had many more offspring with the phenotypes of purple flowers P, long pollen L and red flowers p, round pollen l than expected from independent assortment. (The parental cross was between PPLL x ppll plants.) The F2 generation can be explained because
The F2 generation can be explained because the alleles for flower colour and pollen shape are linked.
When two alleles are linked on the same chromosome, there is a high tendency for the alleles to be inherited together. Consequently, the frequency of the alleles recombining in subsequent generations is low.
This is what Bateson and Punnet observed. There exist a linkage between P and L alleles and also p and l alleles, thereby increasing their frequencies of occurring together and decreasing the frequency of their recombination.
Thus, the F2 generation observed by Bateson and Punnet is due to linkage of alleles.
ead the following scenario and answer the question below Human activities, including fossil fuel combustion, farming, and deforestation, are known to increase the levels of carbon dioxide, methane, and nitrous oxides in our atmosphere. Measurable warming of Earth due to these greenhouse gases can alter ecosystem dynamics. In addition to the direct climatic effects on organisms within biomes, warming can lower levels of sea ice and increase precipitation in Arctic areas. Global warming can also melt permafrost in the tundra and increase sea surface temperatures, which could increase the intensity of hurricanes in vulnerable areas. Within communities, climatic change can shift interdependent species "out of sync," potentially causing indirect loss of species. For example, if pollinators and the plants they pollinate become out of synch, the pollinators may not be able to switch to a different food source, and the plants may not be able to reproduce. Intense hurricanes resulting from global warming can directly lead to ________ within communities.
The given blank can be filled with secondary succession.
In the given case, the events will lead to secondary succession. It is a kind of ecological succession in which the animals and plants get colonize again in habitat after a major disturbance like a devastating hurricane, wildfire, or human activities. The mentioned things can substantially change an area, however, has not entirely made it lifeless.
Secondary succession occurs in the area where the disturbance did not eradicate all the life and nutrients from the environment, that is, different from primary succession in which the development of biological community takes place where no life had prevailed before.
What often develops into the backbone of amphibians?
During winter in the Northern Hemisphere, A. the Sun rises earlier and sets later than during other seasons. B. the Sun appears lower in the sky than during other seasons. C. there are more hours of visible sunlight each day than during other seasons. D. the Sun rises in the Northeast and sets in the Northwest.
B. the Sun appears lower in the sky than during other seasons.
D. the Sun rises in the Northeast and sets in the Northwest.
On the northern hemisphere the north is to the left, the Sun rises in the east (far arrow), culminates in the south (to the right) while moving to the right and sets in the west (near arrow). Both rise and set positions are displaced towards the north in summer, and towards the south for the winter track.
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because days get shorter in the winter
10 what are some major advantages and disadvantages of microwave transmission?
What is the usual result when the ocean breaks pebbles into smaller and smaller peices
The end result would be the production of grains of sand, as found on a sandy beach.
Along with breaking seashells and coral etc. into smaller pieces, this is how beach sand is produced.
The students decided that they would investigate some of the abiotic factors. list three water-quality tests that could be conducted and explain what information each test provides. include in your answers a description of the impact of each factor on the distribution of aquatic organisms
Removal of phloem tissue leads to gradual death of the plant. Why does this happen?
Allergy to pollen is classified as: an autoimmune reaction
The correct answer is D. Immediate hypersensitivity
Allergies are different conditions that occur when an organism is exposed to an allergen, which is a substance, elements, etc that leads to an abnormal immune response. Because of this, allergies are mainly explained as immediate hypersensitivity in the immune system as they usually occurred shortly after the organisms are exposed to the allergen and it is a. Types of allergies include allergies to food, allergic asthma, etc that lead to symptoms such as sneezing, swelling rashes, etc. Therefore, allergy to pollen as any other allergy is classified as an immediate hypersensibility.