Inherited Genetic Disorders | Genetics

Select all of the true statements below.

• Genetic disorders are inherited.

• You have two copies of each gene.

• You receive one copy of each gene from your mother.

• You receive one copy of each gene from your fathe. 

What are alleles?

How many fingers do you think the Pp father has?  (Remember polydactyly is a dominant trait)

• 4

• 5

• 6

The diagram seen here shows the possible combination of alleles in offspring.  What other type of diagram could be used to show the same thing?

• Pie chart

• Punnett square

• Pedigree

Why do you need two cystic fibrosis alleles to have cystic fibrosis but you can have polydactyly when you have only one polydactyly allele along with a normal 5-finger allele?

• Cystic fibrosis alleles are recessive and Polydactyly alleles are dominant

• Cystic fibrosis alleles are dominant and Polydactyly alleles are recessive 

How can two people who don't have Cystic fibrosis have a child that has this serious disorder?  

• Both parents are heterozygous for the cystic fibrosis trait 

• Both parents are homozygous for the cystic fibrosis trait

Do you have any questions?  I will try to address them the best I can in class. 

True or False....All genetic disorders are caused by recessive alleles. 

• True

• False