Can you explain why I got 17 wrong and how to work through it to come to the cor

ID: 214637 • Letter: C

Question

Can you explain why I got 17 wrong and how to work through it to come to the correct answer of 9:6:4:1?
et Help Status Page b. These two genes are linked and there is no recombination through crossing over c. Alleles of these genes are not segregating. d. Alleles of these genes are not assorting independently. Your answer is correct The correct answer is: Alleles of these genes are assorting independently. Question 17 Incorrect 0.00 points out of 1.00 PFlag question Genes D and E are linked on chromosome type 2, separated by a distance of 20 cM. You cross a double heterozygous indietal (Dd Ee)with an individual of genotype Dd ee. What is the phenotypla ratio that you expect from this cross? Select one: a. 9:6:4:1 b. 9:73:1 C.3:3:1:1 X you didn't take into account that the two genes are linked at a distance of 20cM d. 98:4:2 e. 9:33:1 Your answer is incorrect The correct answer is: 96:4:1 18 The next TWO questions refer to the following scenario Question Correct 1.00 points out of 1,00 P Flag question in humans the blood groups A, B, AB, and O are determined by three aleles of an autosomal gene: , and LAleles and I are codominant to each other, and allele i is recessive to the other two The blood type phenotypes of some individuals in the pedigree below are indicated. Empty symbols represent individuals whose phenotype is unknown. Generation 0 :@ -T-O Generation ion·

Explanation / Answer

Answer:

DE/de genotype produces recombinant gametes, De & dE in 20% and each 10% and non-recombinant gametes, DE & de in 80% and each 40%.

De/de produces two types of gametes, De & de. Each gamete probability is 50%

DE/de x De/de

De (0.5)

de(0.5)

DE (0.4)

DE/De (0.2)

DE/de (0.2)

De (0.1)

De/De (0.05)

De/de (0.05)

dE (0.1)

De/dE (0.05)

dE/de (0.05)

de (0.4)

De/de (0.2)

de/de (0.2)

D_E_ = 0.2+0.05+0.2 = 0.45 = 45%

D_ee = 0.05+0.2+0.05+= 0.3 = 30%

ddE_ = 0.05 = 5%

ddee = 0.2= 20%

45:30:20:5 = 9:6:4:1