Question

How many types of zygotic combination are possible between a cross Aa BB Cc Dd x AA bb Ca DD

• A. 32
• B. 128
• C. 64
• D. 16

Answer 1

Answer: (D)

16

• The types of zygotic combinations is calculated by using the formula 2^n
  

where, n = total number of heterozygotes (having the different allele for a trait) present in the parents.

• The genotypes of parents are Aa BB Cc Dd and AA bb Cc DD
  
• As the first parent has three heterozygotes i.e Aa, Cc, Dd and the second parent is having one heterozygote i.e Cc.
  
• Thus, the total number of heterozygotes present in both the parents = 4
  
• The types of zygotic combination = 2⁴= 16.