Question

30 баллов Из какого зародышевого листка развивается печень и желудок? Какое из образований покрытосеменных является триплоидным: а)эндосперм б)спермий в)семяпочка? Объясните различия в механизмах созревания мужских и половых клеток

Answer 1

А) эндо сперма
потому что там 2 спермия

Answer 2

Development of Liver and Stomach from Germ Layers

The liver and stomach develop from different germ layers in the embryo. The liver develops from the endoderm, which is one of the three primary germ layers formed during gastrulation. The stomach also develops from the endoderm layer.

Cited Source: - The liver and stomach develop from the endoderm layer in the embryo.

Triploid Formation in Gymnosperms

In gymnosperms, the triploid formation occurs in the endosperm. The endosperm is a tissue in the seeds of flowering plants and is triploid, meaning it contains three sets of chromosomes. This triploid endosperm provides nourishment to the developing embryo in the seed.

Cited Source: - The triploid formation in gymnosperms occurs in the endosperm.

Differences in the Mechanisms of Male and Female Gamete Maturation

The mechanisms of maturation for male and female gametes differ significantly. In males, the process of gamete maturation is called spermatogenesis, which occurs in the testes. It involves the production of four functional sperm cells from a single spermatogonium through meiosis. In contrast, in females, the process of gamete maturation is called oogenesis, which occurs in the ovaries. It involves the production of one functional egg cell and two polar bodies from a single oogonium through meiosis.

Cited Source: - In males, the process of gamete maturation is called spermatogenesis, while in females, it is called oogenesis