Biology Answers

One adaptation shown by hydrophytes on fresh water habitats is what?

Explain how fractures would have caused the head of the femur to become lodged within the patient’s scrotum

A male black short furred cat mates with a gingershort furred female cat –without further information and using the information you have provided in your keys above, what are the possible genotypes of these two cats and why?You need to show the genotypes as an expression of both genes together -and you need to explain the logic of how you have arrived at your answer).

f)The pair of cats produce in their first litter together the following kittens: 3 tortoiseshell short fur females, 2 tortoiseshell long fur females, 3 ginger short fur males, and 1 ginger long fur male. (no genetic diagrams required), what evidence can you use to deduce the genetic identity of the parent cats?

g)Having identified the genetic identity of the parent cats, fully proof your answer to show the simultaneous transmission of the two genes involved with this family of cats, with the use of genetic diagrams and summaries as required. (Hint: you are only required to show the simultaneous transmission from the P to F1generations)

physical development includes everything a child needs to...

1. survive
2. learn
3. talk
4. breathe
5. walk

Do you think natural selection will happen without the changes in the environment? why?

What's hematology

f) The pair of cats produce in their first litter together the following kittens: 

3 tortoiseshell short fur females, 2 tortoiseshell long fur females, 3 ginger short fur males, and 1 ginger long fur male.

From this information only (no genetic diagrams required), what evidence can you use to deduce the genetic identity of the parent cats?                                                       (4 marks)

g) Having identified the genetic identity of the parent cats, fully proof your answer to show the simultaneous transmission of the two genes involved with this family of cats, with the use of genetic diagrams and summaries as required. (Hint: you are only required to show the simultaneous transmission from the P to F₁ generations)     

Produce a key to clearly show the nature of the genetics associated with the colour of cat fur for the gene given, and in each case justify your choice of letters and / or style of presentation to best depict the genetics involved.                                                          (6 marks)

e) A male black short furred cat mates with a ginger short furred female cat – without further information and using the information you have provided in your keys above, what are the possible genotypes of these two cats and why? (Hint: You need to show the genotypes as an expression of both genes together - and you need to explain the logic of how you have arrived at your answer).                                                               

Gerhart and Pardee measured ATCase activity in the presence of a variety of purine and pyrimidine derivatives. Their results are presented in Table 16.2. What compound(s) were the most effective inhibitors? activators? Explain the significance of the metabolites that served as inhibitors or activators in the context of the biosynthetic pathway presented in Figure 16.1.

Table 16.2: Effect of nitrogen bases, nucleosides and nucleotides on ATCase activity. *Indicates stimulation. (Based on Gerhart and Pardee, 1962.)

Compound

Inhibition, % (Conc = 2 mM)

Cytosine

0

Cytidine

24

CMP

38

dCMP

48

CTP

86

dCTP

88

UTP

8

GTP

35

dGTP

31

ATP

-180*

dATP

-162*

Illustrate the coagulation pathway.