A testcross determines phenotype
__________________ Indicate whether the statement is true or false.
F, genotype
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Which of the following statements about the effects of deforestation on terrestrial ecosystems are true? Check all that apply.
_____ At present rates of deforestation, it is predicted that all of the world's tropical rain forests will be degraded or gone within 10 years. _____ Today, deforestation is one of the greatest problems facing terrestrial ecosystems. _____ Deforestation usually leads to the over-accumulation of nutrients such as nitrates/nitrites in the soil. _____ Deforestation can lead to loss of topsoil. _____ Deforestation can lead to eutrophication of aquatic ecosystems.
What are the components of the Janzen-Connell hypothesis? Select all correct choices
A. Seeds located close to plants of the parent generation will have a higher survival rate. B. Seeds located far away from the parent generation will have a higher survival rate. C. Seeds from rare plants will have a higher survival rate. D. Seeds from common plants will have a higher survival rate.
Chromosome-level gene repression involves
A) supercoiling. B) physical blockage of gene regions. C) chromatin formation. D) nucleosomes. E) All of these
In mammals, an egg fertilized by one sperm divides repeatedly (1-2-4-8-16-32-64, etc.). At the 64-cell stage, only three cells go on to become the embryo while 61 grow to become the fetal side of the placenta. In plants, fertilization likewise results in the development of an embryo and nourishing endosperm. However, how does this process differ from the mammal embryo and placenta?
What will be an ideal response?