Questions 20-21 refer to the er for colorblindness anda also he etorygous for ty

Question

Questions 20-21 refer to the er for colorblindness anda also he etorygous for type who is a carz o and A blood a Recall that colorblindness trait. In the a. S. blood typing system, the allee a aze co-dominant. The allele tor s zecussive to bot B aileles ocarries a colorblind man who has type AS blood. is inherited as an X-1nked recessive r A and both the A and 20. In regard to blood type, the offspring will be: a) all type AB b) all type a c) 1/2 typo A:1/2 d) 1/4 type 0:1/4 type A:1/4 type B:1/4 type AB e) 1/2 type a:1/4 type B:1/4 type AB type B 21. Considering all the offapring. what fraction will be colorblind and female with type A bicod? a) 1/2 b)1/4 c21/8 d) 1/16 e) none Questions 22 and 23 refer to the following. A plant which produces datk crange Flowers is mated ith a atrain which produces white !lowers. The F1 plants produce light orange flosers. gene:ation composed of 1/4 dark ozange: 1/2 1igh: ozange: 74 whitc flowers. An F1 X71 crOSS produces an F2 22. The mechani sm of inheritance il:Lustratec oy this example 13: b) epistass-3 geres a epiotasis-2 genes el complete cominanced rcorplete dorinarce e) co-doninance 23. If a hetercaygous incividual was crcssed with a white Elovered offspring would be procaced. plan, a) 2 cark orange:1/2 white b) 1/2 1ight crange:/2 white c all dark ozanged) al: light zanga

Explanation / Answer

Answer:

Let IAIOrepresents female of blood group A

IAIB represents male of bloodgroup AB

Let X*X be a carrier and unaffected female

and, XY* is an affected and colourblind man

Answer-20: Correct answer is option- (e)

Explaination- If the first table is considered, there are total 4 progenies. 2 have blood group-A, 1 has blood group-AB and 1 has blood group-B. So, 2/4 (or, 1/2) for blood group-A, 1/4 for blood group-AB and 1/4 for blood group-B.

Answer-21: Correct answer is option- (e)

Explaination- According to the question, it asks for a colorblind female with type-A blood group. Out of the possibilies stated in above two tables, here isn't any case to fullfill this. So, the answer in none of the above. However, there are 2 cases above where there are 2 female progenies with type-A blood group who are a carries and a normal, respectively. But that has not been ased in the question.

Now. consider the second case.

Let WW represents dark orange flower colour

and, ww reprents white flowers

Parents WW X ww

Gametes W w

F1 generation Ww (light orange)

Now, F1 X F1

that means, Ww X Ww

Therefore, 1/4 =dark orange ; 2/4 or 1/2 = light orange and 1/4 = white

Answer-22: Correct answer is option- (d)

Explaination- It is incomplete dominance because the trait of the F1 genereation is totally different from the traits of either of the parents. That is, F1 generation is light orange, which is the colour type that ranges between the colour of dark orange and white coloured parents. F1 generation does not express the trait of either of the parents.

Answer-23: Correct answer is option- (b)

Explaination: According to the question, Ww X ww

Therefore, 2/4 or 1/2 = Ww = light orange

and, 2/4 or 1/2 = ww = white

Gametes IA IB IA IAIA IAIB IO IAIO IBIO

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