Yes, sperm can have both structural and numerical chromosomal abnormalities. Further reading: Short Notes Of Biology For NEET Aneuploidy... View Article
Aneuploidy is the most common cause of chromosomal abnormalities. E.g. Down’s syndrome, Patau syndrome, Edward’s syndrome, etc. Further reading:... View Article
Aneuploidy is mostly caused by non-disjunction or non-segregation of a chromosome at the time of gamete formation. Further reading: Short... View Article
Aneuploidy in a foetus can be diagnosed by chorionic villus sampling (CVS) and amniocentesis. Further reading: Short Notes Of Biology For... View Article
All human males inherit an X chromosome from their mothers and a Y chromosome from their fathers. Further reading: Polygenic Inheritance... View Article
Aneuploidy is the presence of one or more extra chromosomes or one or more chromosomes less than the normal chromosomes in a cell or organism.... View Article
Aneuploidy is a chromosomal abnormality, wherein a number of chromosomes are less or more such as monosomy and trisomy. It does not include the... View Article
Aneuploidy is the presence of one or more chromosomes more or less, e.g. 45 or 47 chromosomes in humans. Monosomy and trisomy are types of... View Article
Down’s syndrome is an example of aneuploidy. It is due to the trisomy of chromosome 21. Further reading: Short Notes Of Biology For NEET... View Article
Placenta secretes human chorionic gonadotropin (hCG). hCG helps in maintaining the corpus luteum. It stimulates the release of progesterone in... View Article
Totipotent cells can give rise to the whole organism as well as extraembryonic tissues such as the placenta. Pluripotent cells can give rise to... View Article
Some of the birth defects can be seen in the ultrasound at 19-20 weeks of pregnancy. E.g. heart defects, spina bifida, kidney malfunctions, etc.... View Article
Pluripotent cells can give rise to three germinal layers but cannot produce extraembryonic tissues. Embryonic stem cells are derived from... View Article
No, Corpus luteum secretes progesterone. Placenta secretes hCG. Also Check: Why Is A Single Ovum Produced By Oogenesis? Do Oogenesis And... View Article
Heart develops in the embryo after the first month of pregnancy. Heart starts beating after about 5 weeks of pregnancy. Also Check: Why Is A... View Article
If implantation does not occur, it results in the termination of pregnancy, the uterine lining disintegrates leading to bleeding. Also Check:... View Article
Placenta is formed by the interdigitation of chorionic villi and uterine tissues. It is the structural and functional unit between the growing... View Article
Gastric glands secrete HCl from parietal cells, pepsinogen from peptic or chief cells and mucus from mucus neck cells. Also Check: What is... View Article
A zygote divides by a series mitotic division to produce a cluster of smaller nucleated cells called blastomeres. The blastocyst contains around... View Article
