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Test Questions In Sex Determination

1. How is sex determined in grasshoppers? Can you find other examples of organisms with a similar system of sex determination?
2. Some marine shellfish, such as limpets, become either male or female depending on where they grow. What makes one limpet a male and another a female?
3. Are there other organisms whose sex is determined by environmental factors and not by genetics factors?
4. Certain human chromosomal aberrations that occur during meiosis result in eggs or sperm with two copies of the X chromosome. What happens if that gamete is fertilized? What syndrome is characterized by an XXY genotype? What syndrome is characterized by an XXX genotype? What can you learn about this syndrome?
5. Another type of human chromosomal aberration results when a person inherits one X and two Y chromosomes. What event must occur during meiosis for this to happen? What syndrome is characterized by an XYY genotype? What can you learn about this syndrome?

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Bio homework
1. How is sex determined in grasshoppers? Can you find other examples of organisms with a similar system of sex determination?
In grasshoppers, the male is heterogametic while the female is homogametic. Heterogametic means that different types of gametes are produced. Homogametic means that only one type of gamete is produced. So the male grasshopper produces 2 types of sperm, 1 type has 11 autosomes and 1 x. The other type of sperm contains 11 autosomes and no x. Females produce only 1 type of egg with 11 autosomes only. Humans use this type of sex determination. Males produce 2 types of spermatozoa, one has the x chromosome and one has the y chromosome. Females produce only the y chromosome.
http://www.studentsguide.in/genetics/sex-determination-in-animals/sex-determination-in-grasshopper.html

2. Some marine shellfish, such as limpets, ...

Solution Summary

Sex in different insects, marine life and mamals is determined by a number of factors, including environmental, genetics and occasional abberations.

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