▶️ Answer/Explanation
The uterus, also known as the womb, is the muscular organ where a fertilized egg implants and develops into a fetus. In the provided diagram, Label C points to the thick-walled central cavity of the uterus. To provide context for the other labels: A represents the ovary, which produces eggs; B identifies the Fallopian tube (oviduct), where fertilization typically occurs; and D points to the cervix, which is the narrow neck-like passage forming the lower end of the uterus.
✅ Answer: (C)
✅ Answer: (C)
▶️ Answer/Explanation
The umbilical artery carries deoxygenated blood and metabolic waste products, such as urea and carbon dioxide, from the fetus to the placenta for removal. Consequently, blood in the umbilical artery has a low oxygen concentration. In contrast, the umbilical vein carries oxygenated and nutrient-rich blood from the placenta back to the fetus. Since the placenta filters out waste from the fetal blood into the mother’s system, the blood returning via the umbilical vein has a low urea concentration.
✅ Answer: (D)
✅ Answer: (D)
▶️ Answer/Explanation
This scenario illustrates codominance, where both alleles in a heterozygote are fully expressed, resulting in a “roan” appearance (mixed red and white hairs). In the first cross, homozygous red ($RR$) and homozygous white ($WW$) parents produce $100\%$ heterozygous roan ($RW$) offspring. When two roan cattle ($RW \times RW$) are bred, the resulting genotypic and phenotypic ratio is $1$ $RR$ (red) : $2$ $RW$ (roan) : $1$ $WW$ (white). Because both colors are visible simultaneously rather than one masking the other or blending into a third color, it confirms codominance.
✅ Answer: (B)