If the birds have 18 pairs of autosomal chromosomes and a pair of sex chromosomes, fill in the blanks (i), (ii), (iii) and (iv) in the table given below. (Use symbols Z and W for sex chromosomes).
Given that birds have 18 pairs of autosomal chromosomes, the total number of
autosomes in a diploid cell is (18 ×2 = 36).Birdsalsohaveonepairofsexchromosomes.
Male bird: In birds, males are homogametic, meaning they have two identical sex
chromosomes (ZZ). Therefore:
(i) Total number of autosomes in a diploid male bird cell = 36 (ii) Type of sex chromosomes
in a diploid male bird cell = ZZ Female bird: In birds, females are heterogametic, meaning
they have two different sex chromosomes (ZW). Therefore:
(iii) Total number of autosomes in a diploid female bird cell = 36 (the number of autosomes
is the same in both males and females) (iv) Type of sex chromosomes in a diploid female
bird cell = ZW
Correct Answer : (i) 36 (ii) ZZ (iii) 36 (iv) ZW
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