Which statement is true for a dominant allele?
It gives a greater chance of survival than a recessive allele. It gives the same phenotype in heterozygotes and homozygotes. It is only responsible for male characteristics.
When both alleles are present the resulting phenotype is always an intermediate blend of the two traits?
Phenotypes are only determined by recessive alleles. An individual can have both dominant and recessive alleles. When both alleles are present, the resulting phenotype is always an intermediate blend of the two traits. Recessive traits are expressed only if the dominant allele is absent.
What is a dominant allele quizlet?
A dominant allele is an allele whose trait always shows up in the organism when the allele is present. … A recessive allele is an allele that is masked when a dominant allele is present.
Which statement about dominant and recessive alleles is not true?
Answer:The statement about dominant and recessive alleles which is incorrect is ‘D’. Explanation: D says the phenotype of a homozygote is always dominant which is not true since recessive characters also express their phenotypes in homozygous condition.
Why are alleles dominant and recessive?
The two alleles for a gene don’t need to be the same. The instructions you get from your mom can be a little different from the instructions you get from your dad. And these different instructions — or alleles — will end up making slightly different proteins. This is where dominant and recessive come from.
What is true for expressing recessive characters?
When a trait is recessive, an individual must have two copies of a recessive allele to express the trait. Recessive alleles are denoted by a lowercase letter (a versus A). … Let (S) represent the dominant allele, and (s) represent the recessive allele. Only (ss) individuals will express a smooth chin.
What is a recessive allele example?
The traits due to dominant alleles are always observed, even when a recessive allele is present. Traits due to recessive alleles are only observed when two recessive alleles are present. For example, the allele for widow’s peak is dominant and the allele for straight hairline is recessive.