Question

у животного в соматических клетках 34 хромосомы. Определи число хромосом и молекул ДНК в клетках перед началом мейоза I, в телофазе I и в анафазе II, в зиготе. Объясни ответ в каждом случае.50 БАЛЛОВ!!!!!​

Answer 1

Вам тоже училка дала задание в skysmart?Лан мне тоже ответили на такой вопрос,вот решение:

перед началом мейоза 34хромосомы,

в телофазе 17 хромосом,

в анафазе 2 молекулы по 17 хромосом,

в зиготе 34 хромосомы

Объяснение:

Answer 2

Number of Chromosomes and DNA Molecules in Different Stages

In somatic cells of an animal with 34 chromosomes, the number of chromosomes and DNA molecules varies in different stages of meiosis I, telophase I, anaphase II, and the zygote. Let's examine each case:

1. Before the start of meiosis I: Before meiosis I, the cell undergoes DNA replication during the interphase of the cell cycle. This results in the duplication of the DNA molecules. Therefore, the number of DNA molecules in the cell would be twice the number of chromosomes, which is 68 in this case.

2. Telophase I: Telophase I is the stage of meiosis I where the chromosomes have separated into two daughter cells. Each daughter cell contains half the number of chromosomes as the parent cell. Therefore, in telophase I, each daughter cell would have 17 chromosomes.

3. Anaphase II: Anaphase II is the stage of meiosis II where the sister chromatids separate and move towards opposite poles of the cell. Each chromatid is considered a separate chromosome. Therefore, in anaphase II, the number of chromosomes would be the same as in telophase I, which is 17.

4. Zygote: The zygote is formed when the sperm and egg cells fuse during fertilization. Each sperm and egg cell contributes half the number of chromosomes of the parent cell. In this case, since the animal has 34 chromosomes, the zygote would have 34 chromosomes.

It's important to note that the information provided is based on the available search results, and the specific animal or species is not mentioned. The number of chromosomes and DNA molecules can vary among different animals and species.