|
Sex
|
Timing
|
Source |
The sex of the embryo is determined
genetically.
|
At fertilization |
Sadler, p 319 |
| Genetic sex is established. |
At fertilization |
Williams, p 180 |
| The embryo's chromosomal sex is determined. |
At fertilization |
Moore, p 37 |
| The difference between a male and
a female is determined genetically at the time of
conception. |
At conception |
Rugh, p 7 |
| Microscopic examination can identify
the embryo's sex because the ovaries and testes
have differentiated. |
Day 46 after conception |
Rugh, p 51 |
| The gonads acquire male or female
characteristics. |
7th week of development |
Sadler, p 319 |
| External examination can reveal whether
the embryo is male or female. |
Day 50 after conception |
Rugh, p 7 |
| External genitalia are starting to
indicate whether the fetus will be male or female. |
End of 10th week after fertiliztation |
Williams, p 154 |
| The sex can be established by ultrasonic
measurement of the external genitalia. |
12th week after fertilization |
Sadler, p 113 |
| The sex is clearly distinguishable. |
End of 12th week after fertilization
|
Williams, p 154 |
| The sex of the child can be determined
from external examination. |
12th week after fertilization |
Moore, p 109 |
