9. Mendelian Genetics

Question 1

What is simple dominance?

Answer 1

When one allele (the dominant allele) of a gene completely hides the expression of the second allele (the recessive allele)

Question 2

What is incomplete dominance?

Answer 2

• Neither allele is dominant
• e.g. red flower and white flower = pink flower

Question 3

What is codominance?

Answer 3

• Both dominant allele
• e.g. red flower and white flower = flower with red and white streaks

Question 4

What is autosomal hierarchical dominance?

Answer 4

• 1 > 2 > 3 or R > B > G
• 1,1 or RR
• 2,2 or BB
• 3,3 or GG
• 1,2 or RB
• 2,3 or BG
• 1,3 or RG

Question 5

What is X-linked hierarchical dominance?

Answer 5

• Red: X1X1, X1X2, X1X3, X1Y
• Blue: X2X2, X2X3, X2Y
• Green: X3X3, X3Y

Question 6

What is autosomal circular dominance?

Answer 6

• red (1), blue (2), green (3)
• 1 > 2 > 3 > 1
• Red: 1,1 or 1,2
• Blue: 2,2 or 2,3
• Green: 3,3 or 1,3