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Fertilization most commonly occurs in the fallopian tube, where the sperm meets the ovum. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
Fertilization usually takes place in the fallopian tube, where the sperm meets the ovum. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
Ovarian fate in mammals depends on stabilization and nuclear accumulation of β-catenin, key effector of canonical Wnt signaling. In absence of Sry, R-spondin1 binds Lgr4/5 receptors and inhibits Znrf3/Rnf43 ubiquitination of Frizzled, amplifying Wnt4 signal. This inhibits Gsk3β-mediated destruction complex containing Axin and Apc, allowing β-catenin to accumulate and enter nucleus. Nuclear β-catenin partners with Lef1/Tcf to activate female genes Foxl2, Fst, Wnt4 and repress Sox9/Fgf9. This reciprocal inhibition ensures ovarian differentiation; deletion causes XX masculinization with ectopic Sox9 and testis vasculature.
Ref: NCBI Bookshelf, Molecular Biology of the Cell, Chapter 22: Wnt/β-catenin in ovarian determination.
Fertilization usually takes place in the fallopian tube, where the sperm meets the ovum.
Ref: NCERT Class 12 Biology Chapter 2: Human Reproduction Female Reproductive System and Gametogenesis
Estrogen, secreted by the ovaries, regulates the female reproductive cycle and secondary sexual characteristics.
Ref: NCERT Class 11 Biology Chapter 19: Chemical Coordination and Integration Gonads - Testis and Ovary Hormones
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