What is the meant by homogametic?

: forming gametes which all have the same type of sex chromosome. What is the difference between heterogametic and homogametic?
A sex (male or female) is heterogametic if it has two different sex chromosomes, XY. … A sex is homogametic if it has a matching pair of sex chromosomes.

What is homogametic contact?

The sex of the organism where two sex chromosomes are same is known as homogametic. In some algae, the two gametes are so similar in appearance that it is not possible to categorise them into male and female gametes and thus there contact to each other is term as homogametic contact. Are male birds homogametic?
The gender of both mammals and birds is determined chromosomally. However, whereas male mammals are XY (heterogametic) and females XX (homogametic), in birds it is the females that are heterogametic (WZ) and males are homogametic (ZZ) [below, left].

What is heterogametic in birds?

Heterogametic sex (digametic sex) refers to the sex of a species in which the sex chromosomes are not the same. … However, in birds, and some reptiles, males have two Z sex chromosomes and so are the homogametic sex, while females, with one Z and one W chromosome, are the heterogametic sex. What is male Heterogamety give two example of male Heterogamety?

Male heterogamety (XY males) is a type of sex determination in which males produce two different types of gametes. For example, human males produce two kinds of sperms that is sperm with X- chromosome and sperms with Y- chromosome. Q 32. Q 31.

Frequently Asked Questions(FAQ)

Why are human females said to be homogametic?

The human female possesses two similar gametes. The gametes present in a human female is X and X. therefore, they are called homogametic sex.

What does trisomy mean?

Listen to pronunciation. (TRY-soh-mee) The presence of an extra chromosome in some or all of the body’s cells. This results in a total of three copies of that chromosome instead of the normal two copies.

Do males have XX or XY chromosomes?

Typically, biologically male individuals have one X and one Y chromosome (XY) while those who are biologically female have two X chromosomes.

Why are men considered heterogametic?

The human males produces two types of sex chromosomes, X and Y. Hence, the gametes produced by them are also of two types- one bearing X chromosome and the other bearing the Y chromosome. Hence, human males are said to be heterogametic.

What is female Heterogamety?

Can you have an XXY chromosome?

Klinefelter syndrome is a genetic condition in which a boy is born with an extra X chromosome. Instead of the typical XY chromosomes in men, they have XXY, so this condition is sometimes called XXY syndrome. Men with Klinefelter usually don’t know they have it until they run into problems trying to have a child.

Are chickens Homogametic?

Complete answer: In chickens, females have a pair of dissimilar sex chromosomes i.e., ZW and are designated as 2A+ZW. Males have two similar chromosomes i.e., ZZ and are designated as 2A+ZZ. The females, therefore, are heterogametic and produce two types of gametes A+Z and A+ W types of gametes.

What is ZZ and ZW?

The letters Z and W are used to distinguish this system from the XY sex-determination system. … Males are the homogametic sex (ZZ), while females are the heterogametic sex (ZW). The Z chromosome is larger and has more genes, like the X chromosome in the XY system.

Why is female bird referred to as heterogametic?

The male fruit fly has XY sex chromosomes and produces two types of gametes. Hence, it is called heterogametic. A female fowl has ZW sex chromosomes, thereby producing two types of gametes. Hence, it is called heterogametic.

What is male heterogamety give examples?

Male heterogamety includes human males having XY sex chromosomes and males of some insects, such as grasshopper and bugs, having XO sex chromosomes. Female heterogamety includes females of some species of birds, fishes and insects.

What is male heterogamety describe it in different organism?

Male Heterogamety includes human males having XY sex chromosomes and males of some insects having XO sex chromosome. Female Heterogamety includes the females of some species of birds, fishes, and insects. … In Drosophila, males are heterogametic. Among insects, Lepidopteran has heterogametic females.

What is female heterogamety and explain with one example?

Explanation. Female heterogamety is when there is the presence of two different types of sex chromosomes. The subtypes of heterogametic females are ZO-ZZ and ZW-ZZ. The ZO type of female can be found in moths and butterflies. The ZW type of females can be found in birds, fishes, and reptiles.

Is human male homogametic?

1. In humans, males are called heterogametic because they have X and Y chromosomes in their 23rd pair of the chromosome. On the other hand, females are called homogametic as they have two same chromosomes, i.e. XX chromosomes in their 23rd pair of the chromosome.

Are there any example where males are homogametic?

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). Certain moths and butterflies also show homogametic males and heterogametic females.

What do you mean by homogametic condition give one example?

adjective. Having or producing gametes that possess one type of sex chromosome. Supplement. In humans, females are homogametic. They bear two X-chromosomes.

Which trisomy is fatal?

The term trisomy describes the presence of three chromosomes instead of the usual pair of chromosomes. For example, trisomy 21, or Down syndrome, occurs when a baby has three #21 chromosomes. Other examples are trisomy 18 and trisomy 13, fatal genetic birth disorders.

What syndrome is trisomy 13?

Patau’s syndrome is a serious rare genetic disorder caused by having an additional copy of chromosome 13 in some or all of the body’s cells. It’s also called trisomy 13.

What is the normal trisomy?

The most common is Standard Trisomy 21, in which the father’s sperm or the mother’s egg cell contains the extra chromosome. In Mosaic Down syndrome, the extra chromosome spontaneously appears as the embryo develops. Translocation Down syndrome, which accounts for approximately five per cent of cases, is inheritable.