Sex Determination in Humans (Leaving Cert Biology): Flashcards
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15 cards from this deck
Total number of chromosomes in humans
Total number of chromosomes in humans
46
Number of chromosome pairs in humans
Number of chromosome pairs in humans
23 pairs
Number of autosome pairs
Number of autosome pairs
22 pairs (44 chromosomes)
Number of sex chromosome pairs
Number of sex chromosome pairs
1 pair (2 chromosomes)
Female sex chromosome combination
Female sex chromosome combination
XX
Male sex chromosome combination
Male sex chromosome combination
XY
Which sex chromosome is larger
Which sex chromosome is larger
X chromosome
Approx. number of genes on X chromosome
Approx. number of genes on X chromosome
~1,000 genes
Approx. number of genes on Y chromosome
Approx. number of genes on Y chromosome
<100 genes
Which parent determines the child's sex
Which parent determines the child's sex
The father
What chromosome do all egg cells carry
What chromosome do all egg cells carry
X chromosome
What chromosomes can sperm cells carry
What chromosomes can sperm cells carry
Either X or Y chromosome
When is sex determined
When is sex determined
At the moment of fertilisation
Term for males having different sex chromosomes
Term for males having different sex chromosomes
Heterogametic sex
Term for females having same sex chromosomes
Term for females having same sex chromosomes
Homogametic sex