Select the definition of a Barr body. an active X chromosome inactive Y chromoso

ID: 319744 • Letter: S

Question

Select the definition of a Barr body. an active X chromosome inactive Y chromosome an inactive X chromosome an inactive auto some The first cloned cat, Carbon Copy (CC), was tabby, while the cat she was cloned from, Rainbow, was calico. The surrogate mother was a tabby. Select the explanation that best explains why CC would never have been identical in pattern to Rainbow. During embryogenesis, one X chromosome is randomly inactivated in each cell lineage. The coat color genes are maternal effect genes, so CC looked like the surrogate. The coat color genes are on the mitochondrial genome and inherited with the mother's oocyte. Neither X chromosome is inactivated.

Explanation / Answer

Question

Answer

Explanation

Select the definition of a Barr body

an Inactive X chromosome

A Barr body is the inactive X chromosome found in the somatic cell of females and this inactivation is done during the lionization process.

This is the reason why a typical human female will have only one Barr body per somatic cell, but barr body is absent in a typical human male.

According to Lyon hypothesis, when a cell will have multiple X chromosomes, all but one are inactivated during the process of mammalian embryogenesis

Select the explanation that best explains why CC would never have been identical in pattern to Rainbow

During embryogenesis, one X chromosome is randomly inactivated in each cell lineage.

Here they created the CC (Carbon Copy) by taking the diploid nucleus from the cell was extracted and is injected in another enucleated egg. So, the ovarian cell which was taken from Rainbow has created CC already containing activated black gene and inactive orange gene due to X chromosome inactivation. So when CC will develop also, the cat cell will not going to change the inactivation pattern. CC did not get cells to specify the orange coat color. So CC has got black and white tiger tabby coat.