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Posted by Shivam Jaiswal 6 years, 9 months ago
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Mandeep Sandhu 6 years, 9 months ago
Posted by Shivam Jaiswal 6 years, 9 months ago
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Mandeep Sandhu 6 years, 9 months ago
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Aishwarya S 6 years, 9 months ago
https://www.youtube.com/watch?v=aHCShU4cGis
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Sayeda Iram Ateeq 6 years, 9 months ago
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Sayeda Iram Ateeq 6 years, 9 months ago
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Meghna Thapar 5 years, 5 months ago
Heterothallic species have sexes that reside in different individuals. The term is applied particularly to distinguish heterothallic fungi, which require two compatible partners to produce sexual spores, from homothallic ones, which are capable of sexual reproduction from a single organism. The main difference between homothallic and heterothallic is that homothallic is the condition of having both male and female reproductive structures on the same thallus whereas heterothallic is the condition of having male and female reproductive structures in different thalli.
Posted by Gyanson Wahengbam 6 years, 9 months ago
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Meghna Thapar 5 years, 5 months ago
- The menstrual cycle is complex and controlled by many different glands and the hormones that these glands produce.
- The four phases of the menstrual cycle are menstruation, the follicular phase, ovulation and the luteal phase.
- The first half of the ovarian cycle is the follicular phase shown in Figure 1. Slowly rising levels of FSH and LH cause the growth of follicles on the surface of the ovary. This process prepares the egg for ovulation. ... After about five days, estrogen levels rise and the menstrual cycle enters the proliferative phase. The cycle comprises a follicular phase of 12-14 days, a periovulatory phase of approximately 3 days, and luteal phase of 14-16 days. In the absence of pregnancy, the luteal phase is concluded with regression of the corpus luteum and menses. A single, dominant follicle develops.
Posted by Ipham Sadad Khan 6 years, 9 months ago
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Posted by Gyanson Wahengbam 6 years, 9 months ago
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Aishwarya S 6 years, 9 months ago
*Formation of large number of pollen grain
*Light weight and powdery pollen
* pollen are unwettable and may have wings
*Exposed and versatile anther
*Feathery and sticky stigma
*Absence of Bright coloured,Nectar full,Sweet scented flower
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Mandeep Sandhu 6 years, 9 months ago
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Meghna Thapar 5 years, 5 months ago
Pedigrees represent family members and relationships using standardized symbols. By analyzing a pedigree, we can determine genotypes, identify phenotypes, and predict how a trait will be passed on in the future. Pedigrees are normally used to represent simple dominant and recessive traits. For example, having a widow's peak hairline is dominant. However, they can be carriers of the trait, and if they are carriers, their male children will be colourblind. A pedigree is a genetic representation of a family tree that diagrams the inheritance of a trait or disease though several generations. The pedigree shows the relationships between family members and indicates which individuals express or silently carry the trait in question.
Posted by Vishal Kumar 6 years, 9 months ago
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Sayeda Iram Ateeq 6 years, 9 months ago
Yogita Ingle 6 years, 9 months ago
Inbreeding depression is the reduction in the fertility and productivity of an organism due to continuous inbreeding. Inbreeding is the mating of closely-related individuals within the same breed for 4-6 generations. Continued inbreeding, especially close inbreeding usually reduces the fertility and even productivity of the organism. Two advantages of inbreeding are:
(i) Superior quality of breed of organisms is obtained.
(ii) Pure lines can be developed.
Posted by Harshdeep Kaur 6 years, 9 months ago
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Yogita Ingle 6 years, 9 months ago
Luteal phase-
- In this phase, the ruptured part of Graafian follicle transforms into yellow body called Corpus luteum.
- The corpus luteum secretes large amounts of progesterone hormone which maintains the endometrium for implantation of the fertilized ovum.
- During pregnancy all events of the menstrual cycle stop and there is no menstruation.
- In the absence of fertilization, the corpus luteum degenerates hence causes disintegration of the endometrium leading to menstruation and a new cycle begins.
In human beings, menstrual cycles ceases around 50 years of age and known as menopause.
Posted by Aditya Takuli 6 years, 9 months ago
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Yogita Ingle 6 years, 9 months ago
The formation of carbon copy or replica of D.N.A from parental D.N.A is called replication of D.N.A or duplication of D.N.A.The replication takes place inside the nucleus of eukaryotes in the S-phage of the cell cycle and in the cytoplasm of the prokaryotic cell. Watson and Crick not only proposed the three-dimensional model of D.N.A but also suggested the mechanism of D.N.A replication. In replication, both D.N.A strands uncoil and separate. Each strand acts as a template strand for the formation of a new and complementary D.N.A strand. The template and newly synthesized strand form a new double strand which is identical to the parent D.N.A molecule.
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Shubham Patidar 6 years, 9 months ago
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Aishwarya S 6 years, 9 months ago
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Mandeep Sandhu 6 years, 9 months ago
1Thank You