lab 6

Question 1

what is a karyotype

Answer 1

it is a photograph of the chromosomes of an actively diving cell, showing the number, shape and size of the chromosome

Question 2

on karyotypes how are the chromosomes arranged

Answer 2

into homologous pairs in order of chromosome size for ease of comparison

Question 3

what is turners syndrom

Answer 3

-when females only have one of two of the X chromosomes
-causes short stature, nonfunctioning ovaries, webbed neck, wide chest

Question 4

what is downs syndrome

Answer 4

-has an extra chromosome on the 21st chromosome
-causes mild to moderate mental deficiency
-almond shaped eyes
-poor muscle tone
-short limbs and neck

Question 5

what is klinefelter syndrome

Answer 5

-when males have an extra X chromosome
-men are usually sterile, small testes, low testosterone in blood, learning disability may be present

Question 6

what are common examples of phenotypes determined by sex linked recessive genes

Answer 6

-these traits are not related to the sexually characteristic
-it is things such as red-green color blindness, total color blindness and hemophellia

Question 7

why are makes more likely to exhibit sex linked recessive traits

Answer 7

because females have two X chromosomes. heterozygous females would not exhibit sex linked recessive trait, nut are instead carriers of the trait they would need two recessive alleles in order to show condition

Question 8

can a individual exhibiting a condition considered a carrier

Answer 8

no

Question 9

what is a protan deficiency

Answer 9

it is cause by reducing numbers or a complete absence of red photoreceptors in the eye which results in reduced visablity and darkening of reds. it occurs in 2% of males and 0.4% of females

Question 10

what is a deutan deficiency

Answer 10

i is cause by reduced numbers or a complete absence of green photoreceptors in the eye which results in reduced visability of greens. it occurs in 6% of males and 0.4% of females