Question

In: Biology

1. The probability of aneuploidy offspring is greatest for? a. Non disjunction in meiosis b. Non...

1. The probability of aneuploidy offspring is greatest for?

a. Non disjunction in meiosis

b. Non disjunction in meiosis I and II

c non disjunction in meiosis I

d non disjunction in meiosis II

2. Individuals having one complete set of chromosomes in addition to the normal diploid complement are termed:

a tetraploid

b trisomic

c triploid

d aneuploid

Expert Solution

1. Option c is correct .

If non disjunction occurs in meiosis 1 then , out of 4 gametes 2 will be aneuploid (n-1) , not having any sex chromosome.

If non disjunction occurs in meiosis 2 , then out of 4 , only 1 gametes shows aneuploidy .

So probability of having aneuploid offspring will be greatest when nom disjunction occurs in meiosis 1 in any of the parent .

2. Option c is correct .

Triploidy occurs when a person inherits one complete set of chromosomes along with normal diploid chromosomes ( here one set is haploid set ). So it is 2n +1n=3n.

Trisomy is when person inherits extra copy of any chromosome like 21 in down syndrome . In this , person has 47 chromosome and is considered diploid.

gladiator answered 2 years ago

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