A single ovum of a human being contains:
Correct answer: A. X - chromosome
- A. X - chromosome
- B. XX - chromosomes
- C. YY - chromosomes
- D. XY - chromosomes
Explanation
The correct answer is that a single ovum of a human being contains an X chromosome. This is because the ovum is a haploid cell, meaning it contains only one set of chromosomes, specifically an X chromosome. Human females have two X chromosomes (XX), and during the formation of gametes, one of these X chromosomes is passed on to the ovum. Other options are incorrect because:XX - chromosomes: This configuration is found in diploid cells, not haploid cells like the ovum.YY - chromosomes: Such a combination is not naturally occurring in human biology.XY - chromosomes: This is the typical male chromosome configuration, which is not found in the ovum.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About X-linked Recessive Inheritance
X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.
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More X-linked Recessive Inheritance questions
If the father of a baby is hemophilic and the mother is a carrier then the chances of the baby inheriting the disease will be:
If father of a baby is hemophilic and mother is a carrier then chances if the baby inheriting the disease will be:
The gene for red-green color blindness is present on:
In the human beings, the carrier of color blind is:
Haemophilia affects males than females because of:
Which one of the following is a sex-linked inheritance?