Question

Помогите! Очень прошу! На какой стадии сперматогенеза осуществляется мейоз? 1Размножения 2Роста3Созревания4ФормированияВ результате первого деления мейоза из сперматоцита первого порядка образуются 1Одна яйцеклетка и направительные тельца 2Две соматические клетки3Четыре сперматозоида4Два сперматоцита второго порядкаЧто из нижеперечисленного происходит при сперматогенезе во время стадии формирования? 1Образование жгутика 2Мейоз 3Митоз 4Образование гаплоидного ядра Первая стадия в процессе образования половых клеток, в которой первичные половые клетки делятся путем митоза, носит название1Периода роста2Периода размножения3Конъюгации4КроссинговераЭмбриологические исследования подтвердили, что индивидуальное зародышевое развитие организма1Кратко повторяет историческое развитие вида2Зависит от способа размножения3Зависит от способа оплодотворения4Существенно отличается от исторического развития видаМетаморфоз – это1Измерение размеров тела2Превращение личинок во взрослую форму3Разнообразие формы тела животных разных популяций4Этап эмбрионального развитияВ ходе зародышевого развития возникает бластула, которая представляет собой1Одноклеточный зародыш 2Плаценту 3Многоклеточный однослойный зародыш 4Многослойный зародыш с оболочками Внутренний зародышевый листок эмбриона называется 1Дерма 2Энтодерма 3Эктодерма 4Мезодерма Эпителий кожи у разных видов животных в процессе индивидуального развития образуется из 1Зародышевых оболочек 2Энтодермы 3Эктодермы 4Мезодермы Постэмбриональное развитие с неполным превращением характерно для 1Бабочки Павлиний глаз 2Комнатной мухи 3Зеленого кузнечика 4Майского жука Мышцы у плоских червей образуются из 1эктодермы 2энтодермы 3мезодермы 4мембраны Дайте три правильных ответа В3. Какие признаки развития проявляются у животных только в онтогенезе? 1Одноклеточная стадия 2Покровительственная окраска 3Размеры тела 4Плавательные перепонки 5Бластула 6Гаструла В61. Установите соответствие между характеристикой и периодом образования половых клеток. ХАРАКТЕРИСТИКА А) увеличиваются размеры клеток Б) первичные половые клетки делятся путем митоза В) происходит конъюгация и кроссинговер хромосом Г) осуществляется удвоение хромосом и синтез белка Д) образуются зрелые гаплоидные гаметы ПЕРИОД1) размножение 2) рост 3) созревание В62. Установите соответствие между видом насекомого и способом постэмбрионального развития, для которого он характерен. ВИД А) пчела медоносная Б) комнатная муха В) зеленый кузнечик Г) колорадский жук Д) азиатская саранча СПОСОБ ПОСТЭМБРИОНАЛЬНОГО РАЗВИТИЯ 1) развитие с превращением 2) развитие без превращения В63. Установите соответствие между структурой организма человека и зародышевым листком, из которого она сформировалась. СТРУКТУРА ОРГАНЗМА А) ногтевые пластинки Б) жировые ткани В) обонятельные рецепторы Г) волосяной покров кожи Д) кровь ЗАРОДЫШЕВЫЙ ЛИСТОК 1) эктодерма 2) мезодерма В7. Установите последовательность стадий онтогенеза сцифоидных медуз, начиная с начальной стадии. А) взрослая форма Б) развитие личинки планулы из яйца В) гаметогенез Г) формирование гидроидного полипа Д) образование зиготы

Answer 1

1/3
2/4
3/1
4/2
5/1 здесь неуверенна
6.2
7.3
8.2
9.3
10.3
11.3
12.3
13.1
14.5 6 1
первая часть

Answer 2

On which stage of spermatogenesis does meiosis occur?

Meiosis occurs during the stage of spermatogenesis called spermatocyte maturation or spermatocyte differentiation. This is the stage where spermatocytes undergo two rounds of meiotic division to produce haploid spermatids. The first meiotic division results in the formation of two secondary spermatocytes, and the second meiotic division produces four haploid spermatids [[1]].

What happens during the stage of spermatogenesis called "formation"?

During the stage of formation in spermatogenesis, several important processes occur: 1. Formation of the acrosome: The acrosome, a structure located at the tip of the sperm cell, is formed during this stage. The acrosome contains enzymes that are essential for fertilization [[2]]. 2. Formation of the flagellum: The flagellum, or tail, of the sperm cell is also formed during this stage. The flagellum is responsible for the sperm's motility, allowing it to swim towards the egg [[3]]. 3. Formation of the mitochondria: Mitochondria, which provide energy for the sperm cell, are formed during this stage [[4]]. 4. Formation of the haploid nucleus: The haploid nucleus, which contains half the number of chromosomes as a normal body cell, is formed during this stage [[5]].

What is the first stage in the formation of gametes called?

The first stage in the formation of gametes is called the growth period. During this stage, the primary germ cells undergo mitotic division, resulting in an increase in the number of cells. This stage is characterized by the growth and development of the germ cells before they enter meiosis [[6]].

What is the term for the individual embryonic development of an organism?

The term for the individual embryonic development of an organism is ontogeny. Ontogeny refers to the development of an individual organism from fertilization to birth or hatching. It involves the sequential formation and differentiation of cells, tissues, and organs to form a complete organism [[7]].

What is metamorphosis?

Metamorphosis is the process by which an animal undergoes a distinct change in its body structure and form as it progresses through different life stages. It involves a transformation from one developmental stage to another, often accompanied by changes in behavior, habitat, and feeding habits. Metamorphosis is commonly observed in insects, amphibians, and some other animal groups [[8]].

What is a blastula?

A blastula is a stage in embryonic development characterized by the formation of a hollow ball of cells called a blastocyst or blastula. The blastula is formed during the early stages of embryogenesis and is typically composed of a single layer of cells surrounding a fluid-filled cavity called the blastocoel. The blastula is an important stage in the development of many animals and serves as the precursor to more complex structures and tissues [[9]].

What is the inner germ layer of the embryo called?

The inner germ layer of the embryo is called the endoderm. The endoderm is one of the three primary germ layers that form during embryonic development. It gives rise to the lining of the digestive tract, respiratory system, liver, pancreas, and other internal organs [[10]].

How is the skin epithelium formed during individual development?

The skin epithelium in different animal species is formed during individual development from different embryonic layers. In most animals, including humans, the skin epithelium is formed from the ectoderm. The ectoderm is one of the three primary germ layers and gives rise to the epidermis, hair, nails, and other structures derived from the skin [[11]].

Give three examples of postembryonic development with incomplete metamorphosis.

Three examples of postembryonic development with incomplete metamorphosis are: 1. Butterflies: Butterflies undergo a process called holometabolous development, which includes a complete metamorphosis from egg to larva (caterpillar), pupa (chrysalis), and adult butterfly. This is different from incomplete metamorphosis [[12]]. 2. Houseflies: Houseflies undergo a type of postembryonic development called hemimetabolous development, which involves incomplete metamorphosis. The immature stages, known as maggots, resemble the adult form but lack wings and reproductive organs. They undergo gradual changes until they reach the adult stage [[13]]. 3. Grasshoppers: Grasshoppers also undergo hemimetabolous development. The immature stages, called nymphs, resemble the adult form but lack fully developed wings and reproductive organs. They undergo a series of molts until they reach the adult stage [[14]].

How do muscles in flatworms form?

Muscles in flatworms are formed from the mesoderm. The mesoderm is one of the three primary germ layers and gives rise to various tissues and organs, including muscles. In flatworms, the mesoderm differentiates into muscle cells, which form the muscular system of the organism [[15]].

What are some characteristics of animal development that are only manifested during ontogeny?

Some characteristics of animal development that are only manifested during ontogeny include: 1. Size and shape changes: Animals undergo significant size and shape changes during ontogeny, from the initial stages of development to adulthood. 2. Development of specialized structures: Many specialized structures, such as wings, limbs, and reproductive organs, develop during ontogeny. 3. Development of specific behaviors: Animals learn and develop specific behaviors during ontogeny, such as feeding, mating, and social interactions. 4. Formation of specific tissues and organs: The formation and differentiation of specific tissues and organs occur during ontogeny, allowing animals to perform specific functions.

Match the characteristic with the period of gamete formation:

- A) Increase in cell size - Growth period - B) Mitotic division of primary germ cells - Growth period - C) Conjugation and crossing over of chromosomes - Maturation period - D) Doubling of chromosomes and protein synthesis - Maturation period - E) Formation of mature haploid gametes - Maturation period [[16]]

Match the insect species with the corresponding postembryonic development:

- A) Honeybee - Development with metamorphosis - B) Housefly - Development without metamorphosis - C) Green grasshopper - Development without metamorphosis - D) Colorado beetle - Development with metamorphosis - E) Asian locust - Development with metamorphosis [[17]]

Match the structure of the human organism with the embryonic germ layer it originated from:

- A) Nail plates - Ectoderm - B) Adipose tissue - Mesoderm - C) Olfactory receptors - Ectoderm - D) Hair follicles - Ectoderm - E) Blood - Mesoderm [[18]]

Arrange the stages of ontogeny in scyphozoan jellyfish in the correct order:

- A) Adult form - B) Development of planula larva from the egg - C) Gametogenesis - D) Formation of the hydroid polyp - E) Formation of the zygote

Correct order: B) Development of planula larva from the egg, D) Formation of the hydroid polyp, C) Gametogenesis, E) Formation of the zygote, A) Adult form [[19]]