Essay about Genetics The Inheritance of Color Blindness Worksheet

939 Words Jul 18th, 2015 4 Pages
Virtual Genetics Lab: The Inheritance of Color Blindness Worksheet

Learning Goal: To explore the inheritance pattern of color blindness in humans.
Prerequisite Knowledge: Before beginning this lab, you should be familiar with these concepts: the definition of sex-linked genes, and examples of sex-linked genes in humans and other organisms how the inheritance pattern of sex-linked genes differs from that of autosomal genes the use of Punnett squares to understand patterns of inheritance
Introduction: The gene that codes for red-green color blindness, the most common form of color blindness in humans, is found on the X chromosome. One in 12 males is color blind. In females, however, color blindness affects only about 1 in 200. Why is
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4. Click the Reset button at the bottom. Then, choose Color Blindness again and set the parents’ alleles according to the information about Couple 2.
5. Again, set the number of offspring to the maximum of 6. Then, click the Cross button repeatedly until these parents have produced about 100 F1 offspring.
What percentage of Couple 2’s male and female offspring will be color blind?

The percentage of male offspring that will be colorblind is 10%.
The percentage of female offspring that will be colorblind is 0%.

Part C
Couple 3 comes into your office. The husband is color blind; the wife is heterozygous for the color-blindness allele.

6. Click the Reset button at the bottom. Then, choose Color Blindness again and set the parents’ alleles according to the information about Couple 3.
7. Again, set the number of offspring to the maximum of 6. Then, click the Cross button repeatedly until these parents have produced about 100 F1 offspring.
What percentage of Couple 3’s male and female offspring will be color blind?

The percentage of male offspring that will be colorblind is 22%.
The percentage of female offspring that will be colorblind is 19%.

Part D
Review the results you obtained for the female offspring of the three couples.
Based on your results for the female offspring, predict whether color blindness is a dominant or recessive trait. Explain your reasoning.

Color blindness in female is a

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