explain how the male and female gametophytes fit into the life cycle of pines.
Pines belong to gymnosperm and heterosporous (2n), that means they produce different spores (male and female) and in the life cycle of pines, male and female cones are the most crucial component for the life cycle of this plant, male cone produces male gametophytes (pollen, haploid gamete), transferred to female gametophytes through wind. In case of female gametophyte a production, which happens inside the female cone, forms 4 haploid (n) megaspores out of which only megaspore transform in to female gametophytes (n) through division. Male and female gametes (survived female game) fuse together and fertilization takes place and produces embryo (diploid, 2n).
explain how the male and female gametophytes fit into the life cycle of pines.
how is the sporic life cycle different in ferns and pines?
1. Male cone in the male cones, _(haploid or diploid) male gametophytes called _ _ are produced. These will produce 2. Female cone In the female cones, _(haploid or diploid)_ female gametophytes are produced. This female will contain an egg. 3. Fertilization. When the sperm fertilizes the egg, a _(haploid or diploid)_ embryo is produced. This embryo is the new _(sporophyte or gametophyte)_generation. 4. Seeds Food and a protective coat will be wrapped around the embryo. The embryo, food and...
Using the information you have gathered, address the Focus Question: What is the life cycle of a flowering plant? Draw a circular diagram of the life cycle of a flowering plant. Be sure to include the five structures, listed in Table 1, in the proper order (gametophyte, sporophyte, zygote, spore, gamete). Indicate whether each structure is haploid or diploid and the process by which each structure is produced by the previous structure. You should draw male and female gametophytes and...
Angiosperms produce flower structures on their sporophytes that hold male and female gametophytes. This evolutionary development is a relatively recent adaptation by land plants to increase sexual diversity by attracting insects as pollinators. The flowers are sophisticated organs containing many parts as shown in the diagram. Use the passage to answer the question. The evolution of seeded angiosperms most closely followed the evolution of which of these species? A. insects, because many insects are pollinators O B. reptiles, because many...
7. Draw a sexual life cycle. Explain how a typical plant life cycle is different from an animal life cycle. [4 marks) 8. Explain what happens when a molecule becomes phosphorylated. Give two examples of this process that we have discussed in class. [2 marks] 9. If a cell has 2 picograms of DNA at G1, then how much DNA will each of the daughter cells contain in metaphase Il of meiosis? Explain how you arrived at your answer. [2...
Discuss male and female clinical conditions of the reproductive system and explain how can they effect future fertility.
Compare the hormonal controls of the male reproductive cycle with the hormonal controls of the female reproductive cycle. How are they the same? How are they different? What is this condition called? What causes it? What is ectopic endometrial tissue? What is the rationale for using danazol, a gonadotropin inhibitor? Why do you think oral contraceptives could also be used as a treatment? Is surgical treatment an option, why? Why not? Case Study A 26-year-old female complained of severe, dull,...
for female and male what is the approx. number of stem cells at the beginning of life? do they both use meiosis 1 and 2 for the production of gametes? how long does it take for gametes to mature in both male and female ?
Explain the role of hormones in controlling the female reproductive cycle.
Explain the role of hormones in controlling the female reproductive cycle.