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Beschreibung
Karteikarten von maryam parveen, aktualisiert more than 1 year ago
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Erstellt von maryam parveen
vor mehr als 7 Jahre
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| Frage | Antworten |
| Define meiosis? | Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. |
| What are gametes? | Gametes are the sex cells.They are the: . Eggs produced in the ovaries of the female reproductive system. . Sperm produced in the testes of the male reproductive system. |
| What are the 2 distinct stages in meiosis? | 1: The nuclear membrance . 2: Spindle fibres. |
| How many stages are there in meiosis? | Meiosis have 6 stages. |
| Describe the first 3 stages of meiosis? | Metaphase1: replicated chromosomes form homologous pairs attached to spindle fibres and lined up in the middle Anaphase1: one replicated chromosomes some of each pair moves to each pole. Telophase1: two cells are formed each with one replicated chromosomes. |
| Describe the other 3 stages of meiosis? | Meiosis11: chromosomes line up on the equator attached to spindle fibres. Anaphase11: chromosomes separate and move to poles. Telophase11: Four cells result with one copy of each chromosomes they are haploid gametes. |
| Sexual reproduction? | Sexual reproduction creates variation in population. |
| What type of sexual reproduction occurs in flowering plants? | Flowering plants. ... Sexual reproduction in flowering plants involves the production of male and female gametes, the transfer of the male gametes to the female ovules in a process called pollination. After pollination occurs, fertilization happens and the ovules grow into seeds within a fruit. |
| What are the male gametes in flowering plants? | The male gametes of angiosperms consist of two sperm cells within a pollen grain or a pollen tube. They are derived from a single generative cell, which is formed as the smaller cell by unequal cell division in the microspore after meiosis. |
| What type of sexual reproduction occurs in most animals? | Most animals produces offspring by sexual reproduction. |
| Where does meiosis occur in females? | Meiosis is actually a type of cell division that occurs in the testes of males and in the ovaries of females. Meiosis leads to the formation of cells bearing half the normal number of chromosomes. The process is also referred to as spermatogenesis in males and oogenesis in females. |
| Where does meiosis occur in males? | In the female, meiosis occurs in the ovaries, and in the male, it occurs in the testes. Meiosis creates four new cells, which have half the number of chromosomes of the original cell. |
| OVARY: | The ovary is a ductless reproductive gland in which the female reproductive cells are produced. Females have a pair of ovaries, held by a membrane beside the uterus on each side of the lower abdomen. The ovary is needed in reproduction since it is responsible for producing the female reproductive cells, or ova |
| URETERS: | the duct by which urine passes from the kidney to the bladder or cloaca. |
| CERVIX: | The small opening to the uterus. |
| PROSTRATE GLAND: | a gland surrounding the neck of the bladder in male mammals and releasing a fluid component of semen. |
| Fallopian Tube: | (in a female mammal) either of a pair of tubes along which eggs travel from the ovaries to the uterus. |
| Epididymis: | a highly convoluted duct behind the testis, along which sperm passes to the vas deferens. |
| Uterus: | the organ in the lower body of a woman or female mammal where offspring are conceived and in which they gestate before birth; the womb |
| Penis: | the male genital organ of higher vertebrates, carrying the duct for the transfer of sperm during copulation. In humans and most other mammals it consists largely of erectile tissue and is used also for urination. |
| Bladder: | stores urine. |
| Urethra: | the duct by which urine is conveyed out of the body from the bladder, and which in male vertebrates also conveys semen |
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