Gregor Mendel started experiments on inheritance in the 19. century. The basis of inheritance patterns is the fact that diploid cells contain two copies of the genome and that a gene has different variants, called alleles.Alleles can be dominant (for example, marked A) and recessive (for example, marked a). In a gene locus (position of a gene) there are only two alleles, one from the mother and the other from the father.If individuals have two copies of the same allele they are homozygous (AA (dominant homozygous) or aa (recessive homozygous)). If individuals have two different alleles they are heterozygous (Aa).In autosomal dominant traits, the phenotype is present if both copies of the dominant allele (A) are present (homozygous individuals AA) or only one copy of the dominant allele is present (heterozygous individuals Aa).In autosomal recessive traits, the phenotype is present if both copies of the recessive allele (a) are present (homozygous individuals aa).This is complicated in sex-linked trait, because there are two X cromosomes in females and one X chromosome and one Y chromosomes in males, so terms dominant and recessive are not reliable.It should also be taken into consideration that many traits are complex and caused by many genes interaction and/or environment conditions.
Answer:
A. Acute rheumatic fever.
Explanation:
Acute rheumatic fever is an autoimmune response to the infection of bacteria called group A streptococcus. This infection commonly occurs in children and particularly after 2 to 3 weeks of pharyngitis or sore throat. It has manifestations of cardiac (murmur), rheumatologic, and neurologic.
So, the above symptoms shown in question is purely related to acute rheumatic fever.
Countermeasures to defend systems
against attacks can be classified into two categories: compile-time defenses
and run-time defenses. Countermeasures are tactical solutions designed to avoid
an unsuitable effect in the process. Strategies such as prevention, detection,
and reaction are used to prevent problems.
Stem cell research has many potential future uses. Communication is vital because:
1) Through worldwide collaboration, progress is faster
2) Ethical issues may impede progress if not carefully considered
