History Window Help 0 drive.google.com of Plantspdf- Google Drive Genetics -Goog

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History Window Help 0 drive.google.com of Plantspdf- Google Drive Genetics -Google Drive Apply f 30 Open with Google Docs 1000 19. If a strain heterozygous at loci e, f and g were used in a three point mapping experiment, of 1000 offspring one would double-crossover individuals. 20. A strain heterozygous at loci e t, and g was used in a three point mapping experiment and 10 double crossover individuals were observed out of a total number of 1000 offspring. Interterence was: Ty a) not observed b) 2 c)1 d 0.5 e) 0.2 Questions 21-24 refer to the following. A colorblind woman, is A heterozygous for type A and o blood. She marries a man whos I"L nornal-visioned and has type AB blood. Recall that colorblindnessT is inherited as an X-linked recessive trait. In the A, B, o blood typing system, The alleles for A and B are co-dominant. The allele for o is recessive to both the A and B alleles 21. In regard to blood type, the oftspring will be: all type A, b) all-type A c)-1/2 type A: 1/2 type B 1/2 type. A:1/4 type B:1/4 type AB e 1/4 type 0:1/4 type A:1/4 type B:1/4 type AB 22. Considering all the offspring, what fraction will be both male colorblind? 1/2 ) 1/4 c) none d) 3/4 A. 23. Considering all the offspring, what fraction will be normal visioned les with type A blood? 1/4 c) none d) 1/8 a) 1/2 24. Considering all the offspring, what fraction wil1 be normal visioned FEMALES with type BR blood? a) none b) 1/2- c Page 4 79_ Live MacBook Pro

Explanation / Answer

Answer:

Kindly note, i'm answering those set of questions for which '?' is marked.

PARENTS IA*IO* (XX) x IAIB (XY)

OFFSPRINGS IA*IA (XX)

IA*IB (XY)

IAIO* (XX)

IBIO* (XY)

NOTE: Asterisk (*) means that both the alleles are mutated in female and hence causing colourblindness.

Answer-21,22 are correct.

Answer-23: Correct answer is option- C. This is because, the parent mother is already affected witht he disease condition and all the gametes producted will also be defected. Thus, even if she marries the nomal man, then also all the girls offspring will be acting as carrier of the disease.

Answer-24: Correct answer is option-A. This is because, there is no such possiblity of having a girl with blood group AB. According to the cross, girls can only have blood group A .The given situation can happen in the case of boy which would be colourblind and having AB blood group.

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