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Priyanka Rani 7 years, 5 months ago
Sonali Aggarwal 7 years, 5 months ago
Sexual reproduction is better because in this type of reproduction two parents are involved and offsprings are not an exact copy of the parents
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Yogita Ingle 7 years, 5 months ago
Gene is a stretch of a DNA that determines a particular trait. Genes can mutate and take two or more alternative forms, now these are called alleles of a particular gene. Now allele occurs in a fixed spot in a chromosome and in humans we have two sets of chromosomes. A gene is a part of the DNA. Alleles on the other hand refer to different versions of the same gene. Alleles occur in pairs but there is no such pairing for genes.
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Yogita Ingle 7 years, 5 months ago
The placenta is a large organ that develops during pregnancy. It is attached to the wall of the uterus, usually at the top or side. The umbilical cord connects the placenta to your baby.
Blood from the mother passes through the placenta, filtering oxygen, glucose and other nutrients to your baby via the umbilical cord. The placenta also filters out substances that could be harmful to your baby and removes carbon dioxide and waste products from your baby’s blood.
The placenta produces a number of hormones that are needed during pregnancy, such as lactogen, oestrogen and progesterone. It keeps the mother’s blood separate from the baby’s blood to protect the baby against infections. Towards the end of the pregnancy, the placenta passes on antibodies to protect the baby after birth.
Posted by Hina Sagar 7 years, 5 months ago
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Yogita Ingle 7 years, 5 months ago
Vigorous contraction of the uterus at the end of the pregnancy causes expulsion/delivery of the foetus. This process of delivery of the foetus (childbirth) is called parturition.
• Parturition is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully developed foetus and the placenta which induce mild uterine contractions called foetal ejection reflex. This triggers release of oxytocin from the maternal pituitary. Oxytocin acts on the uterine muscle and causes stronger uterine contractions, which in turn stimulates further secretion of oxytocin.
• The stimulatory reflex between the uterine contraction and oxytocin secretion continues resulting in stronger and stronger contractions. This leads to expulsion of the baby out of the uterus through the birth canal- parturition. Soon after the infant is delivered, the placenta is also expelled out of the uterus.
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