If an egg cell containing the (n+1) number of chromosomes combined with a sperm cell containing the (n) number of chromosomes, what is the result of this union?

We know the gametes contain n number of chromosomes and the union of two gametes egg and sperm result in the formation of zygote which contains 2n chromosomes.

Given the situation, If an egg cell containing the (n+1) number of chromosomes combined with a sperm cell containing the (n) number of chromosomes, it will result in the formation of a zygote containing (2n + 1) chromosomes, a condition that is known as Trisomic.

Trisomic condition can be of different types like:

Full Trisomy: in which an entire extra chromosome is present.Partial trisomy: In which only a small part of extra chromosome is present.Secondary trisomy: In which quadruplicated arms of an extra chromosome are present.Tertiary trisomy: In which extra chromosome contains copies of arms from two other chromosomes.

Trisomy is basically a chromosomal aberration condition and if it happens in a human it can cause serious birth defects in children for example: Down syndrome. Here are few diseases that can be caused due to Trisomic conditions of child:

Trisomy due to addition chromosome 21 (Down syndrome) Trisomy due to addition chromosome  18 (Edwards syndrome) Trisomydue to addition chromosome 13 (Patau syndrome)

Hope it help!

Mantle convection  is the slow  creepingmotion of earth's solid silicate  mantle  caused by  convection  currents carrying  heat from the interior  to the planet's surface.[1][2]  the earth's surface  lithosphere, which rides atop the  asthenosphere  (the two components of the  upper mantle), is divided into a number of  plates  that are continuously being created and consumed at their opposite  plate boundaries. accretion occurs as mantle is added to the growing edges of a plate, associated with  seafloor spreading. this hot added material cools down by  conduction  and  convection  of heat. at the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of  subduction  usually at an  ocean trench.[3]this subducted material sinks through the earth's interior. some subducted material appears to reach the lower mantle,[4]  while in other regions, this material is impeded from sinking further, possibly due to a phase transition from  spinel  to  silicate perovskiteand  magnesiowustite, an  endothermic reaction.[5]the subducted oceanic crust triggers  volcanism, although the basic mechanisms are varied. volcanism may occur due to processes that add buoyancy to partially melted mantle causing an upward flow due to a decrease in density of the partial melt.secondary forms of convection that may result in surface volcanism are postulated to occur as a consequence of intraplate extension[6]  and  mantle plumes.[7]it is because the mantle can convect that the  tectonic plates  are able to move around the earth's surface.[8]mantle convection seems to have been much more active during the  hadean  period, resulting in gravitational sorting of heavier molten  iron, and  nickel  elements and  sulphides  in the core, and lighter  silicate minerals  in the  mantle.