Human Genetics - Biology
Recessive and located on the X chromosome.
Colorblindness is more common in males than in females because the allele for colorblindness is ____
Two copies of every gene located on the X chromosome
A Human female inherits _____
Without an X chromosome
Becasue the X chromosome contains genes that are vital for for normal development, no baby has been born ____
46
How many chromosomes are shown in a normal human karyotype?
Two X chromosomes
Human females have ____
One X chromosome and one Y chromosome
Human males produce sperm cells that have _____
Some gametes may have an extra copy of some genes
If nondisjuction occurs during meiosis ___
Nondisjuction
The failure of chromosomes to separate during meiosis is called ____
One whole X chromosome in a female cell.
The formation of a Barr body inactivates _____
One fo the X chromosomes in a female cell.
What forms a Barr body?
100%
What percentage fo female eggs carry an X chromosome?
Gel Electrophoresis
Which of the following can be used to separate DNA fragments by size?
Because they don't have two X-chromosomes. Females have two X-chromosomes which causes some alleles to deactivate.
Why are Barr bodies not found in male cells?
Because every male has one X-chromosome passed down from the mother.
Why are all X-linked alleles expressed in males, even if they are recessive?
