Sex Determination in Birds — NEET Biology
📚 Practice ConceptIn order to have a distinction with the mechanism of sex determination described earlier, the two different sex chromosomes of a female bird has been designated to be the Z and W chromosomes. In these organisms the females have one Z and one W chromosome, whereas males have a pair of Z-chromosomes besides the autosomes.
Which of the above statements are correct? S1: In the XY type of sex determination system, the male is homogametic and produces two types of gametes, namely X and Y. S2: Females in birds possess one Z and one W chromosome, making them responsible for determining the sex of their progeny. S3: Grasshoppers exhibit an XO type sex determination system where females have two X chromosomes and males have a single X chromosome. S4: In organisms with ZW sex determination, the total number of chromosomes is generally different in males and females. S5: An ovum carrying a Y-chromosome is formed in human females, which upon fertilization with an X-sperm, results in a male child.
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