The curved surface in the night sky on which stars appear to be fixed is called the celestial sphere ecliptic plane orbital path star chart

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

layer 3 is younger than layer 6.

answer///multiple alleles;