CHAPTER 4 – REPRODUCTION AND INHERITANCE


7. Identify whether the following statements are true or false: a. A dominant trait will show in a child if only one parent has the dominant gene. b. A recessive trait will show in a child if only one parent has the dominant gene. c. A dominant trait will show in a child if both parents have the dominant gene. d. A recessive trait will show if both parents have the recessive gene.


8. The gene for positive blood type is dominant over the gene for negative blood type.


a. Using the symbol R to represent the dominant gene and r to represent the recessive gene, carry out the following genetic crosses: i. Male (RR) x Female (RR)


ii. Male (RR) x Female (Rr) iii. Male (Rr) x Female (Rr) iv. Male (rr) x Female (rr)


b. For each genetic cross, identify the percentage of offspring that will be i. positive ii. negative. c. What term is used to describe individuals that are Rr?


9. Huntington’s disease is a genetic disorder that causes brain cells to die. The gene that causes Huntington’s disease (H) is dominant over the normal gene (h). Examine the pattern of inheritance for Huntington’s disease shown in the pedigree chart below and answer the questions that follow.


I II III 1 2 3 4


5 61 11 7 8 9 12


 


:Fig. 4.15


a. How many children do individuals 1 and 2 have together? Identify all of these children by their number on the pedigree chart.


b. Individual 1 is a male without Huntington’s disease. Which of the following options describes his genetic make-up? Justify your answer.


i. HH


ii. Hh iii. hh


c. Individual 2 is a female with Huntington’s disease. Which of the following options describes her genetic make-up? Justify your answer.


i. HH


ii. Hh iii. hh


d. After studying the pedigree chart, do you think it is possible to be a carrier of the gene for Huntington’s disease? Justify your answer.


Elements of Science 39 13 0


14


15


 


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