Sex Determination & Sex Chromosomes 4 Flashcards
(17 cards)
Sex differences depends on the presence of ______________
Sex chromosomes
_______________ determine a sex in a specie so determines if your a male or female
Sex chromsomes
For humans females have two ______ chromosomes so they are homogametic sex & males have an _________ chromosomes so they are heterogametic sex
Have two XX chromosome, X&Y chromosome
In the male there are two types of sperm produce one that carries the X chromosome and one that carries the Y chromosome so therefor the male _______________
Determines the gender (sex)
Humans have 22 pairs of ___________ & one pair of sex chromosomes
Autosomes
Autosomes
Chromosomes that are not sex chromosomes
The ______ gene on the Y chromosome causes a person to be a male
SRY
Hemizygous
Describes the single copy of an X-linked gene (A gene on an X chromosome) in the male
Males are consider ___________ for X-linked genes because they have only one X chromosome
Hemizygous
Wild type trait
Trait that a whole population has so its common
X-linked genes (or X-linked alleles) are only genes on the _____ chromosome
X chromosome
In an X-linked inhertiance the _____ chromosome has no allele & is not involved in the X-linked inheritance its just states that its a boy
Y -Chromosome
What does it mean when result is sex bias?
Means that only a certain gender has the mutant allele (ex. only males are white eye in fruit flies)
What does it mean when results are not sex bias?
Means that both sex have mutant alleles (ex. both male & female fruit flies are white eye)
X-linked inheritance
Genes or alleles on the X-chromosome determines the phenotype (trait) of the organism
X-linked recessive
An allele that is recessive on the x chromosome
X-linked dominant
An allele that is dominant on the X chromosome
