Explore BrainMass
Share

X-Linked Traits

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

1. Eye color is an X-linked gene and red is dominant to white in Drosophila. If I mate a red eyed male with a white eyed female and I mate a white eyed male with a pure breeding red eyed female, the progeny from both crosses will be the same.

A. True
B. False

2. Mary met her partner Bobby at a support group for families dealing with color blindness. Mary and Bobby are unaffected but both have one brother who is affected. They have no knowledge of other family member. Which of the following is true?

A. There is a 100% probability that they will have an affected child.
B. They might both be heterozygotes.
C. Since neither one of them is affected, they are not at risk of having an affected child.
D. Bobby will not pass a mutant allele to either sons or daughters.

© BrainMass Inc. brainmass.com October 25, 2018, 8:23 am ad1c9bdddf
https://brainmass.com/biology/genetics/linked-traits-538217

Solution Preview

Genetics Multiple Choice/True & False
1. Eye color is an X-linked gene and red is dominant to white in Drosophila. If I mate a red eyed male with a white eyed female and I mate a white eyed male with a pure breeding red eyed female, the progeny from both crosses will be the same.

If eye color is an X-linked gene, which mean the trait red is on the X-chromosome. X-linked traits are typical because it only need one recessive allele present for the phenotype to be expressed in the male. (1) Some examples are color blindness. Most men are colorblind because of the X-linked color blind gene that they carried on their X- chromosome.(1)

Let R= red ...

Solution Summary

What is X-linked traits? X-linked traits are genetic traits determined by genes located on the X-chromosomes. Genes are regions of DNA found on chromosomes that carry information for protein production and are responsible for inheritance of specific traits. There are two alleles per gene. One allele for a trait from a gene is inherited from each parent. Sex linked or X-linked traits are passed from parents to offsprings through sexual reproduction.

$2.19
See Also This Related BrainMass Solution

X-linked trait, autoradiograph

Mom Smith is heterozygous for an X-linked trait that can be recognized by a polymorphism when her DNA is cut with Hae III and probed with ExTend probe. The polymorphism is a 3.5kb band for normal and a 1.5kb band for disease. Please diagram what you predict the autoradiograph would look like for the above samples if the Smith sons 1 and 4 are affected and Smith Dad, Mom Jones and Dad Jones are not affected.
1 2 3 4 5 6 7 8 9 10 11 12

-Is the Smith daughter a carrier? Explain.
-What if Dad Jones is also affected but not Mom Jones or Dad Smith?
1 2 3 4 5 6 7 8 9 10 11 12

View Full Posting Details