Single-gene inheritance - Sex-lined single-gene inheritance patterns - Sex chromosomes
7 important questions on Single-gene inheritance - Sex-lined single-gene inheritance patterns - Sex chromosomes
Sexual dimorphism: individuals are either male or female. In most cases, sex is determined by a special pair of ...
Human body cells have ... chromosomes: ... homologous pairs of autosomes plus ... sex chromosomes.
Females have a pair of identical sex chromosomes called the X chromosomes. Males have a nonidentical pair, consisting of one X and one Y. The Y chromosome is considerably shorter/longer than the X.
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At meiosis in females, the two X chromosomes pair and segregate like autosomes, and so each egg receives one X chromosome. Hence, with regard to sex chromosomes, the gametes are of only one type and the female is said to be the homogametic/heterogemetic sex.
At meiosis in males, the X and the Y chromosomes pair over a short region, which ensures that the X and Y separate so that there are two types of sperm, half with an X and the other half with a Y. Therefore, the male is called the homogametic/heterogametic sex.
Plant species showing animal-like sexual dimorphism, with female plants bearing flowers containing only ovaries and male plants bearing flowers containing only anthers.
Do all dioecious plants have a nonidentical pair of chromosomes associated with (and almost certainly determining) the sex of the plant?
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