It is possible for an individual to be genotypically one gender but appear to be the opposite gender. Suppose an individual is genotypically male (XY) but has developed as a female. Explain what has happened and when it might have happened

What will be an ideal response?


Although genotypic sex is determined at conception, the expression of the Y chromosome does not begin until week 6 of development, when the SRY region of the Y chromosome should be expressed in males. If this is not expressed, the individual will develop as a female, which is what occurred in this case.

Biology & Microbiology

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The eyes of the fetus open during the ________ month of pregnancy

a. 4th b. 5th c. 7th d. 6th

Biology & Microbiology

Use Figure 50-4 to predict on which day of a 28-day menstrual cycle estrogen levels would peak


a. 10
b. 12
c. 14
d. 18
e. 22

Biology & Microbiology

Programmed cell death is called apoptosis. Indicate whether the statement is true or false

Biology & Microbiology

All of the following are examples of post-transcriptional regulation except

A) cells can regulate translation by affecting how readily ribosomes associate with mRNA to read it. B) in eukaryotic cells, small noncoding RNAs that work in post-transcriptional regulation include microRNAs and short interfering RNAs. C) cells can regulate translation by methylating certain DNA nucleotides. D) in prokaryotic cells, small noncoding RNAs that work in post-transcriptional regulation include small RNAs. E) cells can regulate how mRNA is spliced and exported out of the nucleus before translation occurs.

Biology & Microbiology