AP BIOLOGY

Detailed explanation-1: -When there is a genotype that consists of a dominant and a recessive allele, the phenotype generally looks like the dominant one.

Detailed explanation-2: -If an allele is recessive, then the gene needs to have two copies (or be homozygous) to express the recessive phenotype. If an organism is a heterozygote, or has one copy of each allele type, then it will show the dominant phenotype.

Detailed explanation-3: -Individuals receive two versions of each gene, known as alleles, from each parent. If the alleles of a gene are different, one allele will be expressed; it is the dominant gene. The effect of the other allele, called recessive, is masked.

Detailed explanation-4: -Dominant and recessive genes. The most common interaction between alleles is a dominant/recessive relationship. An allele of a gene is said to be dominant when it effectively overrules the other (recessive) allele. Eye colour and blood groups are both examples of dominant/recessive gene relationships.

Detailed explanation-5: -When a genotype consists of a dominant and a recessive allele for a trait, the phenotype expressed will be . Q. In prairie chickens the gene for throat sac size shows simple dominant-recessive inheritance. A recessive allele causes small throat sacks and a dominant allele causes large throat sacks.