Explain why color-blindness is much more common in males than in females
What will be an ideal response?
Color blindness is an X-linked recessive trait. Because males are hemizygous for all genes on the X chromosome, they express all recessive allele phenotypes for genes on this chromosome. Therefore, hemizygous males are affected, but only homozygous females are affected. Stated another way, affected males who receive the mutant allele from their mothers transmit it to all their daughters but not to any of their sons. However, daughters of affected males are typically heterozygous and therefore unaffected, but sons of heterozygous females each have a 50% chance of receiving the recessive gene and being affected. In order for females to be affected, they must inherit the recessive allele from both parents, while males only need to inherit the allele from their mother.
You might also like to view...
he route that most accurately describes secretory protein movement through the endomembrane system would be
A. Golgi apparatus?smooth endoplasmic reticulum ?lysosome?vesicles?plasma membrane B. plasmid?plasma membrane?nuclear envelope?smooth endoplasmic reticulum?vesicles C. nuclear envelope?vesicles?Golgi apparatus?rough endoplasmic reticulum?plasma membrane D. lysosomes?rough endoplasmic reticulum?smooth endoplasmic reticulum?vesicles?plasma membrane E. rough endoplasmic reticulum?vesicles? Golgi apparatus?vesicles ?plasma membrane
Which of the following substances can freely pass through the inner mitochondrial membrane?
A) H+ B) Acetate C) CO2 D) ATP
Why might life be much older than LUCA?
What will be an ideal response?
Blocking potassium ion channels in a mammalian cell membrane would __________.
A) decrease the magnitude of the membrane potential B) increase the magnitude of the membrane potential C) increase the resting potential D) decrease sodium's equilibrium potential E) increase potassium's equilibrium potential