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Questions and Answers
What is the key to sexual dimorphism?
What is the key to sexual dimorphism?
- Differentiation of the female and male external genitalia
- Genetic determination of sex at the time of fertilization
- Acquisition of male or female morphological characteristics during the 7th week of development
- Presence of the SRY gene on the Y chromosome (correct)
At what week of development do the gonads acquire male or female morphological characteristics?
At what week of development do the gonads acquire male or female morphological characteristics?
- 5th week
- 3rd week
- 7th week (correct)
- 4th week
What does the SRY gene on the Y chromosome produce?
What does the SRY gene on the Y chromosome produce?
- Mesonephric duct factor
- Ovary determining factor
- Gonadal ridge factor
- Testis determining factor (correct)
When do the pair of primitive gonadal or genital ridges emerge?
When do the pair of primitive gonadal or genital ridges emerge?
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What is the initial content of the primitive gonadal or genital ridges?
What is the initial content of the primitive gonadal or genital ridges?
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Study Notes
Sexual Dimorphism
- The key to sexual dimorphism lies in the development of the gonads, which acquire male or female morphological characteristics around the 7th week of development.
Gonadal Development
- The pair of primitive gonadal or genital ridges emerge around the 4th week of development.
- The initial content of these ridges consists of a mass of cells, including primordial germ cells, which have the potential to develop into either ovaries or testes.
SRY Gene
- The SRY gene, located on the Y chromosome, produces a transcription factor that plays a crucial role in initiating the development of testes.
- The SRY gene is responsible for triggering the process of testicular development, leading to the formation of male gonads.
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