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Dogs are polyovulatory animals and they release more than one egg at a particular time. So, a female dog with 6 puppies in one generation, releases 6 eggs. 
One ovum is released by a human ovary in a month. Identical twins are developed from a single egg. Hence, only one egg would have been released when the mother gave birth to identical twins. If the twins are fraternal twins then they must have been developed from two eggs
The sex chromosome in human female is XX while in a male it is XY. Thus, female produces haploid gametes having all X chromosomes but male produces two types of gametes with either X or Y.  The sex of the child will be dependent on which sperm whether the one with X chromosomes or the one with Y chromosome fertilises the ovum with X chromosome.  Therefore, the sex of the baby is determined by...

It is  the act of birth of baby after the completion of grastrational period . The oxytocin hormone causes strong uteriod contractions which result rupturing of chorion and amnion and there occurs loss of amniotic fluid which lubricants cervix and birth canal for easy passage of baby

Menstrual cycle: The reproductive cycles in female primates is called the menstrual cycle. In a 28 days menstrual cycle, the menses takes place on cycle days 3-5. The menstrual cycle consists of phases like menstrual phase, follicular phase, ovulatory phase and luteal phase. Menstrual phase 1. The production of LH from the anterior lobe of the pituitary gland is reduced. 2. The withdrawal of...
Fimbriae- After ovulation, it helps in the collection of the ovum.
  Acrosome - It is filled with enzymes that hydrolyse egg membrane thus, helping the sperm in penetration of ovum during fertilisation of the ovum.
Endometrium- Implantation of the fertilized ovum and many events of pregnancy takes place in the endometrium.
   Corpus luteum-  It secretes progesterone. Progesterone is essential for the maintenance of endometrium.
A labelled diagram of a section through the ovary is as follows: 
The process of formation of mature female gametes is called oogenesis. It starts during embryonic development stage when millions of oogonia (gamete mother cells) are formed in each fetal ovary. The gamete mother cells start division and enter into prophase-I of meiotic division and get temporally arrested. At this stage, they are called primary oocytes. Each primary oocyte gets surrounded by a...
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