--%>
Assignment Help - homework help

Assignment help on Genetics Science

1.      An oak tree cell with 14 chromosomes undergoes mitosis.

  1. How many daughter cells are formed, and what is the chromosome number in each cell?
  2. If the same cell had undergone meiosis, how many cells would have resulted, and what would have been the chromosome number in each?

2.      Humans have 46 chromosomes in each somatic cell.

  1. How many chromosomes does a child receive from its father?
  2. How many autosomes and how many sex chromosomes are present in each somatic cell?
  3. How many chromosomes are present in a human ovum?
  4. How many sex chromosomes are present in a human ovum?

3.      Somatic cells of chimpanzees contain 48 chromosomes. How many chromatids and chromosomes are present at: 

  1. Anaphase of mitosis
  2. Anaphase I of meiosis
  3. Anaphase II of meiosis
  4. Prophase of meiosis I
  5. A chimpanzee sperm.

4.      In cats, a sex-linked pair of alleles determines coat color.  The allele B results in orange fur, and b results in black fur. 

a.       You and a friend are walking down the street and see a calico cat.  You tell your friend the cat is female.  Your friend doubts your statement, how do you convince him?

b.      An orange male is crossed with a calico female.  If the female has a litter of 6 males, what are the possible phenotypes?

c.       An orange female cat has a litter of 2 calico, and 1orange.  What is the probable sex of the orange kitten?

d.      A calico female has a litter of 7kittens; 2 orange females, 2 calico females, 1 black male and 2 orange males.  What was the probable genotype of the father?

5.      In humans, normal color vision vs. color blindness is determined by alleles C (normal) and c (color-blind) at an X-linked locus.

a.       Can a normal daughter have a color-blind father?  A color-blind mother?  Explain

b.      Can a normal son have a color-blind father?  A color-blind mother?  Explain

c.       Can two normal parents have a color-blind son?  A color-blind daughter?  Explain.

d.      A brother and sister are both color-blind.  Is it possible for them to have a normal brother?.  A normal sister?  One parent who is normal?  Explain.

6. In humans, red-green color blindness is inherited as an X-linked recessive trait.  A woman with normal vision, whose father was color-blind, marries a man with normal vision, whose father was also color-blind.  This couple has a color-blind daughter with a normal complement of chromosomes.  Is infidelity suspected?  Diagram the pedigree and explain your answer.

7. Among 160 progeny in the F2 generation of a dihybrid cross, a geneticist observes four distinct phenotypes in the ratio 91: 21: 37: 11. She believes this result may be consistent with a ratio of 9:3:3:1. Perform a Chi Square test to determine if her hypothesis is correct.

8. There is also a discussion component to this section.  Please log into the discussion board and answer one of the two questions listed for Feb. 11th.  Upon doing so then please RESPOND to the discussion of another student for the question you did not originally answer.  So you should be on the board AT LEAST twice and under each question ONCE.  If you need further guidelines for the discussion please see your syllabus, if you're still unclear then please e-mail me.

 

 

 

 

   Related Questions in Biology

  • Q : Type I and type II diabetes mellitus

    Specify some of the difference between type I diabetes mellitus and type II diabetes mellitus?

    		•
  • Q : How Individuals Behave - Organizational

    They behave differently to different stimuli because of a multitude of factors. These include an individual's age, sex, education, intelligence, personality, physical characteristics, experience, values, and family and cultural background. For instance, a young railway ticket collector would beha

    		•
  • Q : Why visual images are projected in an

    Since the visual images are projected in an inverted way on retina why don't we see things reversed?

    		•
  • Q : Plants control closing and opening of

    How do plants control closing and opening of stomata?

    		•
  • Q : Chemical nature of the molecule Briefly

    Briefly explain regarding the chemical nature of the molecule, that makes a substance antigenic.

    		•
  • Q : Different Views of Organizational

    Much of the literature of this learning, seems to be following in the tradition of learning theories and taking a psychological or individual perspective on the phenomenon. There is a debate about whether or not organizations can learn and many just take the approach

    		•
  • Q : Name the hormones secreted by thyroid

    Name the hormones secreted by the thyroid gland? Also describe their functions?

    		•
  • Q : Need Motivation Theory- Motivation -

    The need theories of work motivation attempt to determine what it is that motivates people at work. The content theorists are concerned with identifying the need/drives that people have and how these need/drives are prioritized. They are concerned with the types of incentives or goals that people

    		•
  • Q : Discharging of the enteric juice In

    In addition to pancreatic juice, the intestine there is discharging of the enteric juice which contains digestive enzymes too. What are such enzymes and which kind of molecule does each of such enzymes break?

    		•
  • Q : Protein fibers of connective tissue

    Name the main types of protein fibers of the connective tissue proper? Answer: The matrix of connective tissue proper is made up of elastic fibers, collagen fibers a

    		•