Answer:
Probability of Dimples and a cleft chin among their offspring = 1/4
Probability of no dimples and a non-cleft chin = 1/4
Explanation:
the allele for the dimple trait D is dominant over the allele for the non-dimple trait d.
the allele for the cleft chin trait C is dominant over the allele for the non-cleft chin trait c.
Mr. Smith has heterozygous alleles for both traits.
Mrs. Smith does not have dimples, nor does she have a cleft chin
Mr Smith DdCc x. ddcc
Probability of Dimples and a cleft chin among their offspring = Dd x dd = 1/2
Cc x cc = 1/2 = 1/2*1/2 = 1/4
Probability of no dimples and a non-cleft chin = Dd x dd = 1/2, Cc x cc = 1/2 = 1/2*1/2 = 1/4.
I think the correct answer is C. An investigation is a type of research that involves observation and collection of data but it does not include a control. In an investigation, all data and information that is related to the subject matter are collected it does not think of any factors that may affect the subject.
The answer for this question is a. DNA
