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प्रश्न
In humans, males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic?
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उत्तर
The term homogametic and heterogametic refer to the organism depending upon whether all the gametes contain one type of sex chromosome (Homo = same) or two different types of sex chromosomes (Hetero = different) Humans show XX/XY type of sex determination i.e. Females contain 2 copies of X chromosome and males contain 1 X and 1 Y chromosome. Therefore, ova produced by females contain the same sex chromosome i.e. X. On the other hand, the sperms contain 2 different types of chromosomes i.e. 50% sperms have X and 50% have Y chromosome open from half the autosomes (Meiosis) Therefore, the sperms are different with respect to the composition of sex chromosome. In case of humans, females are considered to be homogametic while males are heterogametic. Yes, there are examples where males are homogametic and females are heterogametic. In some birds, the mode of sex determination is denoted by ZZ (males) and ZW (females).
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संबंधित प्रश्न
If X chromosome is inherited from mother and Y from father, the offspring will be male.
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
Does genetic combination of mother play a significant role in determining the sex of a new born baby?
Which combination of genes in the zygote will produce children with brown eyes?
Define the following:
Autosomes
Define the following:
Sex chromosomes
In which livings, female decides the sex? Give two examples.
What is parthenogenesis?
Explain the mechanism of sex determination in humans with a suitable chart.
XO type of sex determination and XY type of sex determination are examples of ____________.
Identify the female heterogamety from the chromosomal complements given below.
Read the following statements and select the correct option.
i. If sperm containing Y chromosome fertilizes the ovum, then diploid zygote is formed that grows into a male child.
ii. If sperm containing X chromosome fertilizes ovum, then diploid zygote is formed, that grows into a female child.
Which type of sex determination is observed in honey bee?
ZZ/ZW type of sex determination is seen in ______.
In XO type of sex determination ______.
Which of the following combination of chromosome numbers represents the correct sex determination pattern in honey bees?
The maleness of a child is determined by ______
The maleness of a child is determined by
A trait in an organism is influenced by
Structures present in a cell which is responsible for determination of the sex of a baby is ______.
Which pair of sex chromosome will determine a male?
What is sex determination? Explain the mechanism of sex determination in the case of birds.
How is the sex of a newborn individual determined in different species of animals? Give three examples to support your answer.
An organism that possesses both male and female reproductive organs in the same individual is classified as which type?
What did H. Henking originally call the nuclear structure he discovered during his 1891 study of squash bug spermatogenesis?
In the XX–XO sex determination system, what does the 'O' represent?
In the haplodiploidy system observed in honeybees, fertilized eggs develop into which type of individual?
Which pair of organisms would NOT be expected to share the same sex determination system?
