FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 24: DNA: The Genetic Material

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 21

Essay

Review LaterAdd Note

Review Later

Mitochondrial DNA is maternally inherited, so shouldn't patterns of mitochondrial inheritance and expression parallel that of X-linked genes? Why or why not?

Correct Answer

verified

No, the patterns of inheritance and expr...

View Answer

Show Answer

Question 22

Essay

Review LaterAdd Note

Review Later

Mitochondrial and nuclear DNA differ in density, permitting separation with density gradient centrifugation. What is the source of this density difference?

Correct Answer

verified

The AT:GC ratio of mitochondri...

View Answer

Show Answer

Question 23

Essay

Review LaterAdd Note

The endosymbiotic hypothesis of mitochondrial origins suggests that modern-day mitochondria are descended from symbiotic bacteria, in particular an ancestral member of the purple nonsulfur photosynthetic bacterial group. How can evolutionary biologists be so specific as to group of origin? What kinds of analyses would help narrow down the possibilities, leading biologists to this group?

Extranuclear inheritance refers to genes located in

In the maternal effect case of shell coiling in Limnaea snails, a Mendelian cross starting with a dextral (D/D) female and a sinistral (d/d) male yields ________ F2s.

The endosymbiont theory posits that

Maternal inheritance is also referred to as maternal effect.

The neutral petites genotype of Saccaromyces would be lethal were it not for

Male sterility stemming from mtDNA mutation is termed

Lateral gene transfers between organellar and nuclear genomes appear to be very common. For example, an approximately 270-kb segment of Arabidopsis mitochondrial DNA is found in the nuclear genome of the plant (Lin et al. 1999. Nature 402: 761-768), and a 33-kb piece of chloroplast DNA is found on chromosome 10 in rice plants (Yuan et al. 2002. Mol. Genet. Genomics 267: 713-720). How do you suppose that DNA sequestered in organelles can be transferred to and integrated with nuclear DNA?

The endosymbiosis theory was proposed by Lynn Margulis in the 1980s. Her ideas met with much criticism early on, but ultimately prevailed. Margulis' arguments are a good example of using strong inference, making sense of multiple independent observations with a single explanatory hypothesis. In other words, in this way of investigating nature, seemingly independent observations present a pattern that can be used to deduce process. What are the seemingly independent observations of organellar DNA that make sense in light of the endosymbiosis explanation?

Chloroplasts are found in plant and some protist cells, while mitochondria are found in

Which of the following is lacking from animal mtDNA?

Briefly explain how selective antibiotics can be used to investigate cytoplasmic vs. mitochondrial protein synthesis.

List some features of mitochondrial DNA that make these molecules so useful for population studies.

The genetic code is universal, including organisms of all kingdoms and organellar DNA.

A patrilineal analog of mitochondrial inheritance is

Organellar DNA is typically

Describe the pattern of inheritance you would expect if you crossed petite yeast mutants with wild-type (grande) individuals, if (a) the petite mutant is mitochondrial, or (b) the petite mutant is nuclear.

Which of the following is not a characteristic of non-Mendelian inheritance?