Question

The number of chromosomes in a diploid sexual species is 14. What is the exact probability that an individual of this species could produce by meiosis a gamete that includes all 7 chromosomes that the individual itself inherited from it's mother while excluding all 7 chromosomes inherited from its father?

A) Zero

B) 7/14 = 50%

C) 1/2 ⁷

D) 7 ^1/2

E) 1/7 (1 out of seven gametes) = 14%

F) There is no answer to this question

Answer 1

ANSWER. B. 50%

The process of meiosis is charateristic of organisms that reproduce sexually . Such species have in the nucleus of each cell a diploid (double set ) of chromosomes , consisting of two haploid sets (one inherited from each parent ).

Haploid and dipolid are tems reffereing to the number of setss of chromosomes in a cell. Diploid organisms are those with two sets . In meiosis , a special type of nuclear division which segregates one copy of each homologous chromosome into each new gamete . It reduces the number of sets of chromosomes by half , so that when gametic recombination takes place the ploidy of the parents will be re estabilished. So in this case gametes will have 7 (n) chromosomes . It is half the number of chromosomes (haploid) present in diploid cell (14)

Meiosis also called reductional division, division of a germ cell involving two fissions of nucleus and giving rise to four gametes or sex cells each possessing half the number of chromosomes of the original cell.