More Stuff Flashcards
1
Q
Zygote:
A
- A diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum.
2
Q
Blastula:
A
- An animal embryo at the early stage of development when it is a hollow ball of cells.
3
Q
Morula:
A
- A solid ball of cells resulting from division of a fertilized ovum, and from which a blastula is formed.
4
Q
Blastocyst:
A
- A thin-walled hollow structure in early embryonic development that contains a cluster of cells called the inner cell mass from which the embryo arises.
- The outer layer of cells gives rise to the placenta and other supporting tissues needed for fetal development within the uterus while the inner cell mass cells gives rise to the tissues of the body.
5
Q
Blastocoel:
A
- The fluid-filled cavity of a blastula.
6
Q
Implatation:
A
- Implantation refers specifically to the attachment of the fertilized egg to the uterine lining, which occurs approximately 6 or 7 days after conception (fertilization).
7
Q
Gastrulation:
A
- Process that changes the embryo from a blastula with a single layer of cells to a gastrula containing multiple layers of cells.
- The layers created by gastrulation become germ layers, or special tissues that give rise to specific parts of the organism.
8
Q
Embryo:
A
- General: an organism in early stages of development, before hatching from an egg.
- Human: A fertilized egg that has begun cell division, often called a pre-embryo.
9
Q
Fetus:
A
- The yet-to-be born mammalian offspring following the embryonic stage, and is still going through further development prior to birth.
10
Q
Uterus:
A
- The hollow muscular organ in female mammals in which the fertilized ovum normally becomes embedded and in which the developing embryo and foetus is nourished.
11
Q
Cervix:
A
- The cervix is the lower, narrow part of the uterus (womb).
- The uterus, a hollow, pear-shaped organ, is located in a woman’s lower abdomen, between the bladder and the rectum.
- The cervix forms a canal that opens into the vagina, which leads to the outside of the body.
12
Q
Fertilization:
A
- A process in sexual reproduction that involves the union of male (sperm) and female (ovum) gametes (each with a single, haploid set of chromosomes) to produce a diploid zygote.
13
Q
Parthenogenesis:
A
- A form of asexual reproduction wherein the offspring develops from the egg or female gamete without the prior fertilization from the male gamete.
14
Q
Sexual reproduction:
A
- Reproduction involving the fusion of female gamete (ovum) and male gamete (spermatozoon), which forms a zygote that potentially develops into an offspring genetically distinct from the parent organisms.
15
Q
Asexual reproduction:
A
- Reproduction by which offspring arise from a single organism, and inherit the genes of that parent only; it does not involve the fusion of gametes.
