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What describes a sex linked trait?
Sex linked is a trait in which a gene is located on a sex chromosome. In humans, the term generally refers to traits that are influenced by genes on the X chromosome. In a sex-linked disease, it is usually males who are affected because they have a single copy of X chromosome that carries the mutation.
Which combination of alleles are always involved in the inheritance of a sex linked trait heterozygous alleles?
The answer is c. alleles that are carried on X and Y chromosomes. Sex-linked traits are those traits which inheritance depends on sex chromosomes.
Are sex-linked traits multiple alleles?
What are sex-linked traits? Multiple alleles – more than 2 alleles produces 3 or more genotypes.
How many alleles are in sex-linked traits?
Males are said to be hemizygous because they have only one allele for any X-linked characteristic; males will exhibit the trait of any gene on the X-chromosome regardless of dominance and recessiveness. Most sex-linked traits are actually X-linked, such as eye color in Drosophila or color blindness in humans.
How do you inherit sex linked?
Men normally have an X and a Y combination of sex chromosomes, while women have two X’s. Since only men inherit Y chromosomes, they are the only ones to inherit Y-linked traits. Men and women can get the X-linked ones since both inherit X chromosomes.
What are multiple alleles?
Alleles are described as a variant of a gene that exists in two or more forms. Each gene is inherited in two alleles, i.e., one from each parent. Thus, this means there would also be having two different alleles for a trait. These three or more variants for the same gene are called multiple alleles.
Which allele combination represents a female?
Answer: The correct answer would be XRXr. In humans, X and Y are the sex chromosomes which determine the gender of the person. The males are heterozygous, that is, they are XY whereas the females are homozygous for the X chromosome, that is, XX.
What are the patterns of sex linked genes?
Genes that are located on the sex chromosomes. Because X and Y chromosomes have different genes, sex-linked genes have a pattern of expression that is different from autosomal genes. Because males only have one copy of each type of sex chromosome, they express all of the alleles on both chromosomes.
Is color blindness sex linked?
Males have 1 X chromosome and 1 Y chromosome, and females have 2 X chromosomes. The genes that can give you red-green color blindness are passed down on the X chromosome. Since it’s passed down on the X chromosome, red-green color blindness is more common in men. Males have only 1 X chromosome, from their mother.
What are examples of sex-linked disorders?
Examples of such disorders include Duchenne and Becker muscular dystrophy (both of which are neuromuscular disorders), fragile X syndrome (a type of mental retardation), and some types of leukodystrophy (a group of disorders that affect the central nervous system).