School and Work

1) In a typical cross where a parent with a completely dominant trait is mated with a parent exhibiting a completely recessive trait, what is the expected genotypic outcome and allelic frequency for the F1 progeny? Give an example.

2) In a typical cross where hybrid F1 parents are mated, what is the expected genotypic outcome and allelic frequency of the F2 progeny? Give an example.

3) For the F2 progeny produced from a typical F1 hybrid mating, how many totally recessive individuals would be produced if the progeny total population is six offspring? What if the progeny population was 20? 50? 1,000?

4) Excluding factors such as sex-linked genes, incomplete dominance or epistasis, etc., will the above cross results vary if different organisms are used, such as dogs or tulips? Why or why not?

5) How will factors such as sex-linked genes, incomplete dominance, or epistasis, etc., affect the expected outcomes that were investigated above?

I am finishing up a report and these are the only questions I have left and I am stumped. Any help would be greatly appreciated. THANK YOU!

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Home >All Categories > Science & Mathematics >Biology >Open Question Kristy Member since:November 16, 2009Total points:340 (Level 2)1: Discuss how the concept of horizontal gene transfer relates to bacteria. Include the following in your discussion:
bacterial mechanisms of horizontal gene transfer and how they differ from normal inheritance
the importance of horizontal gene transfer to the treatment of bacterial infections
the effects this concept has on evolutionary relationships inside and outside the bacterial domainAnswer Question

by Jack Martin Member since:March 22, 2011Total points:129 (Level 1)I'll do your homework for $50...

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Home >All Categories > Science & Mathematics >Biology >Open Question xxdreamb... Member since:August 07, 2008Total points:16 (Level 1)I'm considering going into the field of Marine Biology, but I was wondering about how many jobs there would be. What kind of water do marine biologists go in? What exactly do they do on a weekly basis? What's the pay like? Is it difficult to do in college? and any other information about it.Answer Question

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1. the inference that evolution occurs gradually over time,
a. is not supported by any fossil evidence
b. is known as coevolution
c.is supported by many transiyionl forms in the foaail record
d.was proposed by lyell

4. the traits of individuals best adapted to survive become more common in each new generation because

a. offspring do not inherit those trait
b. the adapatation responsible for those traits increase through natural selection
c. those individuals do not breed
d. natural selection does not affec well adapted individuals

5. natural selection causes
a. changes in the environment
b. plants and animals to produce more offspring than can survive
c. changes in the frequency of certain adapattions in a population
d. genetic variation with populations

6. the similarity in the body shape of a whale an of a fish is an example of
a.divergent evolution
b.convergent evolution
c.coevolution
d.vestigal structures

7. which of the following must exist in a population in order for natural selection to act

a. genetic variation
b. overproduction
c. struggle for survival
d. all of the above

I need it for the practice test study thanks

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Help! Can anyone find the answers online for me? I'd LOVE to spend time with family now rather than spending forever filling out these multiple choice questions for only 5 points! Is anyone good at searching the depths of the internet??
The questions begin like this:
1. Which of the following plant groups was the earliest to appear on land? (a. conifers, b. seedless vascular plants, c. gymnosperms, d. angiosperms, e. bryophytes)
2. Which of the following was an adaptation that made land life possible for plants?

The top of the page says AP Biology Practice Exam 2 and the page number looks like is 309 and goes until 319.

Please help!!

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1) Bile is produced by hepatocytes, draining through the many bile ducts that penetrate the liver. Bile then flows into the common hepatic duct, which joins with the cystic duct from the gallbladder to form the common bile duct. The common bile duct in turn joins with the pancreatic duct to empty into the duodenum. If the sphincter of Oddi is closed, bile is prevented from draining into the intestine and instead flows into the gallbladder, where it is stored and concentrated to up to five times its original potency between meals.

2) Pancreatic juice secretion is regulated by the hormones secretin and cholecystokinin, which is produced by the walls of the duodenum upon detection of acid food, proteins and fats. Pancreatic secretion consists of an aqueous bicarbonate component from the duct cells and enzymatic component from the acinar cells.

Hope this answers your question.
Regards
TSS

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This is the question: The blood pressure in the artelrioles supplying the body tissues is higher in a mammal than in a fish. Explain what causes this?

Thanks a lot!!

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For cells in which carbon dioxide crosses the plasma membrane by simple diffussion, what determines the rate at which carbon dioxide enters the cell?
a.the concentration od dioide carbon ofneach side of the memnbrane
b. the amount of ATP produced by the cell
c. the number of carrier proteins in the membrane
d. the amount of enery available
e.the concentration of hydrogen ions on each side of the membrane

Carbohydrates associated with cellular membranes are typically asociated with
a.proteins inside cells
b. lipids inside cells
c. proteins outside cells
d. proteins of the internal organelles
e. the nuclear membrane

Thanks alot

for the frist one i have no idea for the second one i think is c bit im not sure...thanks!

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