When the gametes fused during fertilization, the offspring would have more chromosomes in their body cells than their parents have. as a result, the species’ chromosome number would not be constant.

In humans this is known as down's syndrome. Instead of 23 pairs of chromosomes people with downs' syndrome have 24 pairs.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.