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Gurugrah Questions: Your Source for Thoughtful Queries, Your Gateway to Enlightening Answers.
Sequence No.
BIO-379
Explain the mechanism of sex - determination in birds.
Or
Write the chromosomal basis of sex - determination in birds.
Or
Give one example of organism exhibiting female heterogamy.
Answer:
Female heterogamy is exhibited by birds. They have ZW - ZZ type of sex-determination.
In this type, the male is homogametic and the female is heterogametic. Therefore, there are two types of eggs i. e., with Z and with W and only one type of sperms i. e., each with Z.
When egg with Z-chromosome is fertilized by a sperm with Z-chromosome, a zygote with ZZ-chromosomes is formed. Similarly, when egg with W-chromosome is fertilized by a sperm with Z-chromosome, a zygote with ZW chromosomes (female) is formed.
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BIO-379
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