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Depending on the animal species, the process can occur within the body of the female in internal fertilization, or outside in the case of external fertilization. The fertilized egg cell is known as the zygote. [2] [5] To prevent more than one sperm fertilizing the egg , fast block and slow block to polyspermy are used. Fast block, the membrane ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 28 December 2024. Union of gametes of opposite sexes during the process of sexual reproduction to form a zygote This article is about fertilisation in animals and plants. For fertilisation in humans specifically, see Human fertilization. For soil improvement, see Fertilizer. "Conceive" redirects here ...
A pregnant mongrel A feral dog from Sri Lanka nursing her puppies Gestation in a dog is 63 days in length, if measured from the day of ovulation. Since it is difficult to determine the exact date of ovulation, errors are often made in calculating gestation period. [ 21 ]
A pregnant lioness. In mammals , pregnancy is the period of reproduction during which a female carries one or more live offspring from implantation in the uterus through gestation . It begins when a fertilized zygote implants in the female's uterus , and ends once it leaves the uterus.
Pregnancy Symptoms Week 2. Since conception doesn't usually occur until two weeks from the start date of your last period, you still aren't pregnant during week two, but your body is getting ...
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.
By Nia Williams (Reuters) -The Western Canadian province of Alberta will spend C$29 million ($20.46 million) to create a new sheriff-led patrol unit to police its 298-kilometer (185-mile) border ...
Another downside is that you may incur penalties for making early withdrawals before you turn 59.5 years of age. This could mean as much as 10% on top of any income taxes you would pay.