Biology 1B - pedigrees

Question 1

what is a pedigree

Answer 1

a diagram that shows the occurrence and appearance of genetic traits across several generations of a family
used to determine modes of inheritance
uses symbols to represent people and lines to represent genetic relationships

Question 2

what do the symbols in a pedigree mean:
circle
square
horizontal lines
vertical lines
shading
diagonal line

Answer 2

circle - female
square - male
horizontal lines - mating
vertical lines - offspring
shading - trait of interest
diagonal line - person is deceased

Question 3

what can determine if a trait is autosomal or X linked

Answer 3

pedigrees

Question 4

describe what autosomal and X linked traits are

Answer 4

autosomal - passed from parents to offspring independent of the X and Y chromosomes
X-linked - almost exclusively passed on the X chromosome which determines if an individual is XX or XY

Question 5

what are the 4 modes of inheritance

Answer 5

autosomal dominant
autosomal recessive
X linked dominant
X linked recessive

Question 6

can pedigrees have multiple modes of inheritance

Answer 6

yes

Question 7

what can X linked traits not do

Answer 7

be passed from father to son
male always passes on their Y chromosome to their son