Fraternal twins:
Correct answer: D. Can be one boy and one girl
- A. Can be only two boys
- B. Can be only two girls
- C. Cannot be one boy and one girl
- D. Can be one boy and one girl
Explanation
In some cases, more than one egg is produced by the female, and all these eggs are independently fertilized forming two or more zygotes. These zygotes develop into new offspring, but with different genetic combinations. Such twins or triplets are called fraternal twins or triplets. They are produced sexually. As this process is not affected by type of chromosome, the two zygotes can give rise to same or opposite genders.
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About Reproduction
Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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