homozygous and heterozygous

What is Hemophilia 血友病?

• a medical condition in which the ability of the blood to clot is severely reduced, causing the sufferer to bleed severely from even a slight injury.

• a genetic disorder where there is a 23rd chromosome

• a type of gene

• an allele

Tags

NGSS.HS-LS3-2

What does hemophilia cause to the body?

• Cause cuts to not stop bleeding.

• bruising

• headaches

• muscle spasms

What does dominant（显性的） mean?

• It means the stronger of the two genes, normally written in a capital letter (such as 'A').

• It means a trait that is overpowered by the dominant trait, normally written in lower case (such as 'a').

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What does recessive mean?

• It means the stronger of the two genes

• It is normally written in a capital letter , such as 'A'.

• It means a trait that is overpowered by the dominant trait

• It is normally written in a lower case, such as 'a'.

Which of the following is an example of a homozygous dominant trait?

• gg

• Gg

• GG

Which of the following is an example of a homozygous recessive trait?

• RR

• rr

• Gg

Which of the following is an example of a homozygous dominant trait?

• RR

• rr

• Gg

Which of the following is an example of a homozygous recessive trait?

• RR

• rr

• Gg

How are heterozygous traits written?

• hh

• WW

• Gg

What component of blood is involved in clotting?

• erythrocytes

• leukocytes

• platelets

• phagocytes

Tags

NGSS.HS-LS1-3