Science flahscards week 7 Flashcards
What are sex-linked genes?
Genes that carried on sex chromosomes .
What is the Cystic Fibrosis?
mucus in lungs & intestines;
mutation of 3 base pairs.
What is a carrier?
a person who does not show the observable trait but is carrying the hidden recessive allele on the sex chromosome.
What is Sickle-cell Anemia??
sickle shape red blood cells
which can not carry much oxygen; codominant allele.
What is Hemophilia?
slow or no blood clotting; recessive
allele (sex-linked disorder).
What is Down-Syndrome?
extra copy of chromosome 21
causing a form of mental retardation.
What is a Karyotype?
picture of all chromosomes from
within a (body) cell.
what is meiosis?
cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells.(sexual Reproduction.)
What are human sex cells called?
Gametes
How many chromosomes are there in a human body cell?
46 chromosomes.
How many chromosomes are in a human sex cell?
23 pairs of chromosomes.
what is pedigree?
A pedigree is a chart used to track which family members have a particular trait.
What is a phenotype?
All traits.
What is the male sex cells?
Sperm
What is a woman’s sex cells?
Egg.
