Please answer all the questions thoroughly Unit 3: Plants and Ecology 1. Flowers

Question

Please answer all the questions thoroughly

Unit 3: Plants and Ecology 1. Flowers are comprised of whorls which make up the petals, reproductive organs, cto kind of genes control the development of the whorls of a flower? How are the designated by these genes? expressed? Would it simply lose a whorl or would the whole flower fail to develop? reproductive organs, etc. What rls of a flower? How are the different parts the flower if one of the genes What would happen to the f lower if one of the genes was not 2. You perform an ecological study on a population of deer native to regions of North Dakota. One population has a large range of 500 k to use as a habitat. The other population has two 250 km ranges, connected by a biological corridor, to use as a habitat. Although the seco population has the same amount of space, it is significantly smaller than the first population Explain what factors might be in play here that are causing this difference. nd ulation.

Explanation / Answer

Ans 1.There are four whorls in flowers (order from outside to inside):

There are three classes of genes which control the development of these whorls:

Class A

Class B

Class C

Together this is called ABC model. A, B and C gene products are transcription factor.

Sepals are controlled by gene A

Petals are controlled by gene A and B

Stamen are controlled by gene B and C

Carpels are controlled by gene C

If any one gene fails to express that whorl will be missing but flower will still develop.

If there is mutation in Class A there will be no Sepals and Petals in flower.

If there is mutation in Class B there will be no Petals and Stamen

If there is mutation in Class C there will be no Stamen and Carpels

Ans. 2

Biological corridor- The Central American Commission for Environment and Development defines a biological corridor as "a geographically defined area which provides connectivity between landscapes, ecosystems and habitats, natural or modified, and ensures the maintenance of biodiversity and ecological and evolutionary processes."

Habitat Fragmentation- process by which habitat loss results in the division of large, continuous habitats into a greater number of smaller patches of lower total area, isolated from each other.

Fragmentation increases isolation between forest communities and it increases so-called edge effects.

Edge effect- In ecology, edge effects are changes in population or community structures that occur at the boundary of two habitats. Areas with small habitat fragments exhibit especially pronounced edge effects that may extend throughout the range.

Since, smaller areas are connected only with a biological corridor, which means there will be restricted movement between deer population of two areas due to which there will be more pronounced inbreeding, that leads to less genetic diversity and reduced biological in the deer population. Two smaller areas also means less core to edge ratio which will exhibit greater edge effect. All this leads to smaller population size.

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