Answer the following statements true (T) or false (F)
1. Homologous chromosomes are identical copies of each other.
2. Mitotic cell division is never used by organisms as a means of reproduction.
3. A diploid queen honeybee produce eggs by meiosis. Some of these eggs are never fertilized, while the rest are. These unfertilized eggs develop into haploid male honeybee. This can be an example of sexual reproduction.
4. For any given species, cells in metaphase II of meiosis would contain 2X more genetic material than cells in metaphase of mitosis.
5. The karyotype of a normal human male would show a total of 23 pairs of homologous chromosomes.
1. FALSE
2. FALSE
3. TRUE
4. FALSE
5. FALSE
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In the Chiricahua Mountains in Arizona, a species of spider is found in both the woodland
areas around streams and in the desert shrub areas. In the woodland areas, these spiders are under constant threat of predation from birds. Because of this, they spend little time in the exposed portion of their sheet webs. However, in the desert areas where birds are less of a threat, spiders constantly forage in the exposed portion of their webs. Offspring of matings between spiders from woodland and desert regions behave more like spiders from the desert habitat, even if they are living in the woodland area. The offspring quickly fall prey to birds, often before they have had a chance to reproduce. Over time, two different species arise.
What type of reproductive barrier led to this speciation event?a. reproductive b. geographical c. temporal d. mechanical
Heritability refers to
A) the genetic contribution to a phenotype in a population at a particular time. B) the genetic contribution to the variability of a phenotype in a population at a particular time. C) the number of genes contributing to a trait in a population. D) the degree to which offspring resemble parents.
A DNA sequence can be patented if
A) two or more people isolate the same sequence successfully. B) it forms a single gene. C) it has economic implications. D) it is useful as a tool for research or as a novel or improved product.
LHON is a rare mitochondrial disease caused by weak hypomorphic mutations that affect the mitochondrial electron transport chain. The first symptoms of the disease include blindness. People with LHON are usually homoplasmic because retinas must be homoplasmic mutant for a person to have disease symptoms. Which is true about a male who is heteroplasmic for the mutation that causes LHON? (Select all that apply.)
A) He is likely to develop the disease in other parts of his body. B) He may have children who are blind due to LHON. C) All of his children will most likely be homoplasmic for the wild-type mitochondria. D) Some cells in his body are probably homoplasmic.