Separation of sister chromatids occurs in which of the following stages of mitos

Question

Separation of sister chromatids occurs in which of the following stages of mitosis and or meiosis? A) Anaphase B) Anaphase 1 C) Anaphase 2 D) A and C E) A and B An individual has the genotype RrGg. What possible gametes can they form, assuming these genes are unlinked? A) Rr or Gg B) Rr, Gg, RR, GG, rr, gg C) RrGg, RRGG, rrgg, rrGG, rrGg, Rrgg, RRgg D) RG, Rg, rG, rg E) All of the above Which of the following can lead to a genetic trait appearing to "skip" generations? A) Recessive inheritance pattern B) Variable penetrance C) Maternal effect D) All of the above Nail patella syndrome is an autosomal dominant disorder that is genetically linked to blood type. If they are separated by a distance of 30 centimorgans, what is the probability that a child of III-6 and III-13 will have both nail patella, and O blood type? A) 0% B) 15% C) 30% D) 50% E) 100%

Explanation / Answer

5.The correct answer is:D) A and C.

Reason: In mitosis, anaphase and in meiosis, anaphase II is the phase of separation of sister chromatids.

6.The correct answer is: D)RG,Rg,rG,rg

Reason: Above will be the gametes formed.

7.The correct answer is:A)Recessive inheritance pattern

Reason: Recessive traits tend to skip generations.

8)The correct answer is:D.50%

male

Nail patella syndrome is an autosomal dominant trait.Presence of a single dominant gene from either parent is sufficient to express the trait in offsprings.Again,O blood type is always expressed in recessive condition.So, the affected child will have O blood type as both parents are O type.

probability = 2/4 * 100 = 50%

female Xa Y X XXa affected XY normal X XXa affected XY normal

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