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Under what condition is a single recessive allele expressed in a male?
A single recessive allele will be expressed in a male if he inherits that allele on his only X chromosome, as males have one X and one Y chromosome. This is because the presence of the recessive allele on the X chromosome has no dominant allele to mask its expression.
A phenotypic trait that results from a single dominant allele is?
polydactyly Because it has to do with the frequency of the allele for 6 digits. Although this is dominant, its occurance is much lower than the ressesive 5 fingers. I think Natural selection plays a part in this phalangeal paradox. Maybe the ones with 6 fingers could not buy gloves in the winter so they froze to death,...
Is gigantism a dominant or recessive gene?
Gigantism is usually caused by a hormone disorder, not a single gene being dominant or recessive. In some rare cases, gigantism can be caused by a genetic mutation, but it is not a simple dominant or recessive trait.
Which are some diseases caused by an autosomal dominant allele?
The following list (thanks to Wikipedia) are diseases caused by an autosomal dominant allele. Familial hypercholesterolemia Polycystic kidney disease Neurofibromatosis type I Hereditary sherocytosis Marfan syndrome Huntington's disease Hereditary nonpolyposis colorectal cancer Multiple exostoses
What genes appear when genes are dominant?
When a gene is dominant, its effect will be expressed when present in the genotype, overshadowing the influence of the recessive allele. The dominant gene codes for a specific trait or characteristic that will be visible in the individual's phenotype, even if only one copy of the dominant allele is present in the genetic makeup.
What disease is caused by a dominant allele of a single gene?
Huntington's Disease
Under what condition is a single recessive allele expressed in a male?
A single recessive allele will be expressed in a male if he inherits that allele on his only X chromosome, as males have one X and one Y chromosome. This is because the presence of the recessive allele on the X chromosome has no dominant allele to mask its expression.
What is the probability that a particular allele will be in a gamete?
chromosome segregationIf the character is governed by a single allele and it is dominant, than its probability to be in the gamete is 75%.
What are the Dominic?
Dominant allele disorders are single gene disorders which take effect in the heterozygous state.
What are the dominate alleles?
Dominant allele disorders are single gene disorders which take effect in the heterozygous state.
Iis down syndom caused by a dominant or recessive allele?
Down syndrome is caused by the presence of an extra copy of chromosome 21, known as trisomy 21. It is not caused by a single gene with a dominant or recessive inheritance pattern. It is a chromosomal disorder that can occur randomly during cell division.
What are dominant alleles?
Dominant alleles are genetic variants that are expressed when present in a single copy in an individual's genotype, masking the expression of a recessive allele. In a heterozygous individual (having two different alleles for a gene), the dominant allele will determine the phenotype. Dominant alleles are represented by a capital letter in genetic notation (e.g., A).
Which statement best describes a dominate allele?
okay well the dominant form of an allele, is YO MOM she is the answer to all your problems and yea te va pegar con la mexican chancla
A single gene trait that has two alleles and that shows a simple dominant recessive pattern will result in?
A 3:1 phenotypic ratio (Mendelian inheritance).
A phenotypic trait that results from a single dominant allele is?
polydactyly Because it has to do with the frequency of the allele for 6 digits. Although this is dominant, its occurance is much lower than the ressesive 5 fingers. I think Natural selection plays a part in this phalangeal paradox. Maybe the ones with 6 fingers could not buy gloves in the winter so they froze to death,...
Is anencephaly dominant or recessive?
Anencephaly is a neural tube defect that is typically considered a sporadic condition caused by multifactorial and environmental factors, rather than being directly linked to a single gene that follows traditional dominant or recessive inheritance patterns.
If a allele is masked is it recessive?
If an allele is masked, it is most likely recessive, but not necessarily. This is due to epistasis, the interaction between two or more genes to control a single phenotype. For example, "K" codes for more keratin pigment in the skin, but "k" does not. One can still be albino, however, for if they get the dominant "A" allele, this allelle will override and mask the dominant "K" pigment in the skin, making the person albino.
