As we know that the genes are known to be the blueprint of our systems. The copy of these genes is stored in the nucleus of each cell of the body. A normal human cell has a total of 23 pairs of chromosomes. Any change that has occurred in the number of chromosomes would ultimately lead to an anomaly.
Trisomy is a condition that is caused when the person has got three copies of one of the chromosomes. This results in a total of 47 chromosomes instead of 46. The children that are affected by trisomy have delayed development and intellectual disabilities. The age of females at the time of conception is considered to be one of the factors that cause trisomy.
Down, Patau and Edward syndromes are examples of trisomy. Down syndrome is also termed as trisomy 21 as the person has 3 copies of the chromosome 21. The affected persons have slanted eyes, around and flat face and have a small stature.
Meiotic nondisjunction is much more likely than mitotic nondisjunction. Based on
A woman who is heterozygous, Bb, has brown eyes;
Explain why familial breast cancer shows a dominant pattern of inheritance in
How is an F′ factor different from an F factor?
With regard to the timing of conjugation, explain why the recipient
The raw material for evolution is random mutation. Discuss whether or
Why is an antibody used in this experiment? From
Explain the type of speciation (allopatric, parapatric, or sympatric
In fruit flies, curved wings are recessive to straight wings,
A recessive allele in mice results in an unusally long neck.
