A phenotypic trait is considered sex-linked when O the phenotype is only expressed after sexual intercourse. O the genes for the phenotype occur on X or Y chromosomes. O the phenotype only occurs in females. O a trait only occurs in males. O both A and D
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Step 1: Sex-linked traits are traits that are determined by genes located on the sex chromosomes, which are the X and Y chromosomes. Show more…
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These traits will show a range of phenotypes within a population, known as ____________________ variation. 36. A sex-linked trait is a trait that is expressed from genes on either the ______ or ______ chromosomes. It is more likely that a sex-linked trait and its gene will be on the ______ chromosome because it is a larger chromosome. 37. A female that has one copy of a mutated gene and one normal copy of the gene will not show the mutated phenotype, but will instead be a ____________________ of the mutated phenotype. 38. Males only have one copy of the X chromosome, so they will only need one copy of a mutated X chromosome gene to have the mutated phenotype. Make a Punnet square showing the genotypes and phenotypes of offspring of a mother that is not colorblind, but is a carrier for colorblindness (X = normal, x = colorblind; her genotype is Xx) and a father that is not colorblind (his genotype is XY) below (you can do this on a separate piece of paper and take a picture - #38). F1 genotypes and percentages: _____________________________________________________________________ F1 phenotype and percentages: _____________________________________________________________________ 39. Autosomes are non-sex chromosomes and genes will therefore be on chromosomes 1-22. Individuals, regardless of gender, will have two copies of each of these genes. When a disorder or disease only occurs in an individual when it has two copies of a mutated allele that is RECESSIVE to the normal, completely dominant gene, we call it an ________________________________________ (3 words). An example of this type of disease is ________________________________________ (3 words). These disorders tend to stay in populations because they can be masked in heterozygous individuals. Make a Punnet square showing the genotypes and phenotypes of offspring of a mother that does not have sickle cell anemia, but is a carrier for sickle cell anemia (S = normal, s = sickle cell) and a father that does not have sickle cell anemia, but is a carrier for sickle cell anemia (you can do this on a separate piece of paper and take a picture - #39).
Adi S.
In humans, a trait that is 'sex-linked' is determined by a gene located on the 23rd chromosome. This trait appears more frequently in males than in females. It may be carried by females on one chromosome but not the other. All of these are true of sex-linked traits.
All the following are true about sex-linked traits EXCEPT: Traits are expressed when the an allele is unopposed by the corresponding chromosome A female often carries a trait that the male offspring expresses Y-linked traits are more common than X-linked traits Sex-linked traits are found on the 23rd pair of chromosomes
Madhur L.
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