Question

In: Biology

A certain species of shrimp are sexually-reproducing, diploid organisms with 86 chromosomes per typical cell.

How many chromosomes would be in a cell from this species of shrimp that is:

(In the interest of credit, please neatly show only the work pertaining to your final answer for each question in this area.)

a) a triple nulisomic somatic cell?

b) a single trisomic somatic cell?

c) a double trisomic gamete?

Expert Solution

As given in question

A typical diploid cell of shrimp contains 86 chromosomes.

It means 43 pairs of chromosomes.

A triple nullsomic somatic cell

No. of chromosomes in somatic cell= 86 chromosomes

= 43 pairs of chromosome

Nullisomic = 2n-2 (both the chromosome of a pair are absent)

No. of chromosomes in a triple nullisomic somatic cell= 86-6=80 Chromosomes

= 43-3= 40 pairs of chromosomes

{-6 because of triple(3) nullisomic condition}

A single trisomic somatic cell

No. of chromosomes in somatic cell= 86 chromosomes

= 43 pairs of chromosome

Trisomic = 2n+1 (one extra chromosome in pair is present)

No. of chromosomes in a single trisomic somatic cell =86+1= 87 Chromosomes

=43 pairs of chromosome + 1 extra chromosome

A double trisomic gamete

No. Of chrosomes in gamete= 43 chromosomes (Half of 86 chromosomes)

Trisomy in gamete= n+1

No. of chromosomes in double trisomic gamete= 43 +1+1 chromosomes

= 45 chromosomes

gladiator answered 2 years ago

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