How many chromosome pairs are responsible for sex inheritance in dogs if their diploid set is 78? - briefly
In dogs, there is one pair of chromosomes responsible for sex inheritance out of their total diploid set of 78 chromosomes. This pair determines whether a dog will be male or female, with XX indicating female and XY indicating male.
How many chromosome pairs are responsible for sex inheritance in dogs if their diploid set is 78? - in detail
In mammals, including dogs, the determination of sex is governed by the X and Y chromosomes. Dogs, like humans, have a diploid set of chromromosomes, which means that each somatic cell contains two sets of chromosomes, one inherited from each parent. The total number of chromosomes in dogs is 78, arranged in 39 pairs. Out of these 39 pairs, 38 are autosomal pairs (non-sex determining), while one pair determines the sex of the offspring.
In female dogs, both chromosomes in the sex-determining pair are X chromosomes, resulting in the karyotype XX. In male dogs, one chromosome is an X and the other is a Y, leading to the karyotype XY. The Y chromosome carries the genetic information that triggers the development of male characteristics.
Therefore, in dogs with a diploid set of 78 chromosomes, one pair of chromosomes is responsible for sex inheritance: the X and Y chromosomes.