Human Genetics - Biology

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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?


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