7. In a species of insect with Z/W sex determination chromosomes, female sex det

Question

7. In a species of insect with Z/W sex determination chromosomes, female sex determination is due to Tra-W, a gene on the W chromosome. Do we expect male or female sex determination for an individual with: ZZW chromosomes ii. ZW chromosomes, with a disabling mutation in Tra-W ii. ZZ chromosomes, with one wildtype Z chromosome and one ZraWchromosome, 1. which carries a copy of the Tra-W gene iV. LWW chromosomes 8, Common differences in sex chromosome numbers are either an ‘extra' chromosome (XXY or ZZW) or a 'missing' chromosome (XO or ZO). Is male or female development expected for these cases given that the sex determining gene for a particular species is on Sex Determin. gene on an Missing (XO/ZO X chromosome Y chromosome W chromosome Z chromosome Extra

Explanation / Answer

7. Although ZW system is different from XY system yet it shows some of the similarities. This is seen in insects and birds. In this males are homozygous, i.e., ZZ and females are hemizygous, i.e., ZW.

i. The individual with ZZW is female but with anomalies.

ii. ZW with disabling mutation in Tra-W will not be able to determine specific gender as Tra-W determine the sex of the female.

iii. It will act as the female. bisexual basically

iv. ZWW will be female with the abnormality

8.

sex determination gene on an missing(XO/ZO) extra(XXY/ZZW) x chromosome male female y chromosome no determination male z chromosome male female w chromosome no determination female

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