Ahuman fertilized egg contains one chromosome with hbs, the allele for sickle cell disease, and a homologous chromosome with hbs, the wildtype allele. it also contains an x and y chromosome. at what point will meiosis occur to create cells that are either hbs or hbs

After attainment of puberty during the process of spermatogenesis.

Explanation:

Given that the fertilized egg has one X and one Y chromosome as the sex chromosomes, the zygote will develop into the human male.

After the attainment of puberty, the process of sperm formation, the spermatogenesis, would occur in the testes of the male.

Spermatogenesis includes meiosis in sperm mother cells to produce haploid sperms. During anaphase-I of meiosis I, the separation of homologous chromosomes to the opposite poles would separate the wild type allele Hbs from the allele for sickle cell disease, HbS.

The sperms produced by the end of meiosis II would have either HbS or Hbs allele.

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1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.