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qid 3096 · biology
Question: Explain the mechanism of the genetic determination of sex in man .
- The temperature during embryonic development determines the sex.
- The presence of an X or Y chromosome in the mother determines the sex of the offspring.
- The presence of the X chromosome determines the sex.
- The sex is determined by environmental factors after birth.
- The presence of two Y chromosomes determines that an individual will be male.
- The presence of the Y chromosome determines that an individual will be male. Fertilization of the X-bearing egg by an X-bearing sperm results in a female offspring, and by a Y-bearing sperm results in a male offspring.
- The number of chromosomes determines the sex.
- The sex is determined by the mother's genetic contribution exclusively.
- The presence of two X chromosomes results in a male offspring.
- The size of the chromosomes determines the sex.
Our answer: F. The presence of the Y chromosome determines that an individual will be male. Fertilization of the X-bearing egg by an X-bearing sperm results in a female offspring, and by a Y-bearing sperm results in a male offspring. Source quote machine-checked (exact quote)
How it was answered
Multi-step solver (maze), replayed by code
Current source
MedlinePlus Genetics, "Y Chromosome"
https://medlineplus.gov/genetics/chromosome/y/
“Sex is determined by the SRY gene, which is responsible for the development of a fetus into a male.”
Source quote machine-checked (exact quote)
Earlier version (superseded)
https://medlineplus.gov/genetics/chromosome/y/
Source weak (http_get_200_text_and_question_terms)
Earlier version (superseded)
No public source has been found for this card yet (3 places checked internally).
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