47 chromosomes instead of 46 because there are 3 chromosomes in pair 21. This is called Down syndrome, described most recently by Lejune in 1958
Answer:
The correct answer to the definition of a dominant allele is the allele that stops or hides the expression of another allele in an organism (B).
Explanation:
The expression seen, usually called phenotype is controlled by genetic compositions enclosed within the chromosomes in the nucleus, if eukaryotes, or nucleoid, if prokaryotes. The chromosome is a pair of two alleles, which are responsible for the trait, with the two possibilities that can be seen. The allele which has the potential of silencing the other allele is called the dominant allele, they are usually represented in capital letters, they will dictate the phenotype of the organism even in the presence of the other allele. This other allele is called recessive allele, which are only expressed when they are homozygous. Dominant allele expresses themselves both in heterozygous and homozygous genotype.
RNA is important to cells because it relays information encoded in DNA to tiny organs within the cell, called ribosomes, which produce protein according to the RNA's instructions.<span> RNA is thus vital to the basic functioning of the cell.</span>
Two alleles expressing exactly the same information for a trait are described as homozygous.
An individual is homozygous for an allele if the two alleles are identical. Two normal alleles or two alleles with the same variation can both be present in a homozygous genotype. When an organism is homozygous, it signifies that it possesses two copies of the same gene allele.
If an organism possesses two copies of the same dominant allele, it is said to be homozygous dominant, and if it possesses two copies of the same recessive gene, it is said to be homozygous recessive. For instance, there are two variants of the gene for seed shape in pea plants: one form (or allele) for round seed shape (R), and the other for wrinkled seed shape (r).
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If the human cell has 46 chromosomes, the daughter cells will have 23 in each. The daughter cells are haploids.