Consider this statement: "Humans are much more able to tolerate missing a sex chromosome than they are able to tolerate missing an autosome." Conduct research to understand what a "Barr body" is. Do not submit an answer with a lot of scientific jargon. Using basic biology vocabulary, explain "Barr body" in your own words. Respond directly to the statement above with regards to females. Dr. Murray Barr (1908-1995) was a Canadian researcher who co-discovered Barr bodies. Some of the work he did involved studying coat (fur) color in calico cats. Coat color in these cats is determined by a sex-linked gene, but it also involves Barr bodies. Using your knowledge of genetics, describe how calico cats get their color. Compare male and female calico cats.
Added by Juan Luis S.
Step 1
It consists of an inactive X chromosome. Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 100 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Katlin K.
Calico cats have a randomly patterned coat. Which of the following correctly describes why this occurs? A. Two copies of the X chromosome are expressed in some portions of the cat's fur, but in others, one of the copies of the X chromosome has been randomly silenced. B. The gene for coat color is located on the X chromosome, which is only expressed in regions of the body not important in sexual characteristics, including the fur. C. The gene encoding coat color is located on the X chromosome. In different parts of the body, one or the other X chromosome is randomly shut off. D. As cells divide, the X chromosome previously sequestered to the Barr body is reactivated, causing an alteration in coat pattern.
Joanna Q.
Coat color in cats is determined by genes at several different loci. At one locus on the X chromosome, one allele $\left(X^{+}\right)$ encodes black fur; another allele (X") encodes orange fur. Females can be black $\left(\mathrm{X}^{+} \mathrm{X}^{+}\right)$, orange $\left(\mathrm{X}^{\circ} \mathrm{X}^{\circ}\right),$ or a mixture of orange and black called tortoiseshell $\left(\mathrm{X}^{+} \mathrm{X}^{\circ}\right)$ Males are either black $\left(X^{+} Y\right)$ or orange $\left(X^{\circ} Y\right) .$ Bill has a female tortoiseshell cat named Patches. One night Patches escapes from Bill's house, spends the night out, and mates with a stray male. Patches later gives birth to the following kittens: one orange male, one black male, two tortoiseshell females, and one orange female. Give the genotypes of Patches, her kittens, and the stray male with which Patches mated.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD