Genetics Answers

A cell has been exposed to a certain lethal chemical that results in the translation machinery to start reading the transcripts in either the 5’ or 3’ end. Which of the properties of the genetic code is affected after this chemical exposure?

In reality, if the selected pair for your group mate, do you think it is possible for their offspring to achieve the assigned trait to your group? Why do you think so?

A widow's peak hairline is dominant (W) to a straight hairline (w). Karen and her brother both have a straight hairline, but her parents and sister all have a widow's peak. Complete the Punnett square that shows Karen's family.

Describe the two irreversible in the cell cycle. Put the references.

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)

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

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).                                                               

1. Hypothetically, you are given the chance to enhance/modify a trait of certain

plant/crop. These are the things that you will consider to make a genetically modified

organism (GMO)

a. Identify special trait.

b. Identify a source organism

c. Identify a target organism

d. Identify the modified/ added trait

e. What benefit/s would the recombinant organism provide to society?

In summer squash, white fruit color (A) is dominant over yellow fruit color (a). If a squash plant

homozygous for white is crossed with a plant homozygous for yellow, what will the phenotypic and

genotypic ratios be for: