![vicilicious74](/avatars/1615.jpg)
vicilicious74
21.09.2019 •
Biology
Why can the lyon hypothesis not be tested in a human female who is homozygous for one allele of the x-linked g6pd genea. one cannot test the lyon hypothesis in a human female with homozygous x-linked genes because the test requires an individual with an abnormal set of chromosomes (47, xxx or 48, ) to see differences in x chromosome activity.b. one cannot test the lyon hypothesis in a human female because inactivation of x chromosome occurs early in embryonic development.c. one cannot test the lyon hypothesis with homozygous x-linked genes because in the absence of allelic alternatives inactivation of x chromosome does not occur.d. one cannot test the lyon hypothesis with homozygous x-linked genes because the test requires identification of allelic alternatives to see differences in x chromosome activity.
Solved
Show answers
More tips
- F Food and Cooking Homemade French Fries: The Ultimate Guide...
- D Dating, Love, Relationships How Long Can Love Last?...
- A Auto and Moto Mastering One-Movement Parking: All You Need to Know...
- C Computers and Internet How to Properly Order Clothing from International Online Stores...
- H Health and Medicine Headache: A Comprehensive Guide to Treatment...
- F Family and Home How to Choose the Best Diapers for Your Baby?...
- A Auto and Moto Discovering the Leader: What is the Most Expensive Car in the World?...
- F Food and Cooking How to Quickly Put your Child to Sleep?...
- C Computers and Internet How to Create a Website for Free and Easy?...
- F Family and Home Parquet or laminate, which is better?...
Answers on questions: Biology
- B Biology Explain why cancer is more common in older adults...
- B Biology Identify the characteristics of fungus-like protists. Check all that apply. decomposers autotrophs produce spores stationary...
- B Biology Given the DNA Sequence, ATGTTAGCCGTATGC, what is the amino acid sequence?...
- B Biology Pink hair is dominant over blue hair in smurfs. Cross a homozygous dominant hair smurf with a homozygous recessive hair smurf. Include your genotype and phenotype ratios...
- B Biology What is responsible for the structures and functions of organisms...
- B Biology What caused the creation of mitochondria?A. One cell took over another cellb. Life forms became more complicatedc. Cells needed more energyd. DNA was shared between cells...
- B Biology What is one common feature between receptor-kinase signaling and steroid hormone receptor signaling....
- B Biology Can you identify the genotype of a person with normal melanin? why or why not?...
- E English Explain the language of A gathering of old men...
- E English Which statement correctly describes the characterization in this excerpt? Dialogue characterizes Robin Hood as a thief. Dialogue characterizes Robin Hood as uninterested....
Ответ:
D. One cannot test the Lyon hypothesis with homozygous X-linked genes because the test requires identification of allelic alternatives to see differences in X chromosome activity.
Explanation:
Lyon hypothesis explains dosage compensation in mammals with XX-XY type of sex determination. The human females have two copies of X chromosomes while human males have only one copy of the X chromosome.
To balance the number of X linked genes between males and females, one X chromosome in all the somatic cells of a human female is inactivated during early embryonic development and is a presence in form of Barr body.
The inactivation of the X chromosome is random and either maternal or paternal X chromosome from a cell of a human female can be inactivated.
To observe the Lyon hypothesis, the expression of X linked genes is observed. For the purpose, the female should be heterozygous for a particular X linked gene to observe the expression of different alleles in her cells due to random inactivation of either of the X chromosome.
A human female with a homozygous X linked gene would express the same allele of the gene in all of her cells irrespective of the inactivation of the paternal or maternal X chromosome.
Ответ: