Males in animals always possess two distinct sex chromosomes, while females have the same sex chromosomes. Which of the following disproves this statement?

There are many animals that have XO type of sex determination.

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In birds, males have the same type of sex chromosome, while females have a distinctive pair.

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Eggs can never possess the Y chromosome.

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Sperms can possess either an X or a Y chromosome.

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Solution

The correct option is B
In birds, males have the same type of sex chromosome, while females have a distinctive pair.

Sex determination based on the chromosomes need not always be the same as we see in humans, where males have XY chromosome and females have XX chromosome. In fruit flies, males have only one X chromosome, while females have two X chromosomes. However, birds have a completely different set of chromosomes. The males possess ZZ sex chromosome and the females have ZW chromosome, which is a stark contrast to what we see in humans.

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Similar questions

Males in humans always possess two distinct sex chromosomes, while females have the same sex chromosomes.

	List I		List II
A	In human beings and a number of other animals, there are two types of chromosomes, ______, and allosomes.	1	44+XY
B	_______ are those chromosomes which control functions of the body, other than sex determination. Allosomes or sex chromosomes are the chromosomes that determine the sex of the individual in unisex organisms.	2	Autosomes
C	Human beings have _____ pairs of chromosomes.	3	23
D	_____ determine the sex of the individual.	4	Sex chromosomes
E	The two sex chromosomes of females are similar and are called _____ chromosomes. They are dissimilar in human males. One is a normal-sized X-chromosome. The other is smaller with a good amount of non-function chromatin. It is called the Y-chromosome.	5	XX
F	The chromosome complement of human females is ______	6	44+XX
G	Human males is _____. Human females are homogametic, i.e., produce only one type of gametes or ova (22 + X). Humans are heterogametic, i.e., they produce two types of gametes sperms, angiosperms, and gymnosperms.	7	Autosomes

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