chapter 5 genetics and heredity

Question 1

why did mendel use pea plants

Answer 1

they use sexual repr. he forced them to cross polinate

Question 2

differnt forms of a gene

Answer 2

allels

Question 3

what does the principal of dominance state

Answer 3

some alleles are dominant while others are recessive

Question 4

what does a dominat trait look like and when is it expressed

Answer 4

capital letter if 1 copy is inherited

Question 5

when does a recessive allele show

Answer 5

when the dominat trait isnt present

Question 6

what does a recessive trait look like and when is it expressed

Answer 6

lower case letter and if 2 copies are inherited

Question 7

which trait do heterozygous pairs get

Answer 7

dominant

Question 8

what does the law of segregation state

Answer 8

copies seperate from eachother during gamete formation

Question 9

both alleles are the same form

Answer 9

homozygous

Question 10

what does a homozygous dominat look like (t)

Answer 10

TT

Question 11

what does a homozygous recessive look like (t)

Answer 11

tt

Question 12

alleles are differnt forms

Answer 12

heterozygous

Question 13

what does a dominat heterozygous look like (t)

Answer 13

Tt

Question 14

what are genotypes

Answer 14

the letters (genetic makeup)

Question 15

what are phenotypes

Answer 15

words(physical descriptions)

Question 16

what is codominance

Answer 16

Heterozygote displays BOTH alleles at same time

3 phenotypes

Question 17

what is incomplete dominace

Answer 17

Heterozygote is a BLEND of both parent’s alleles

3 phenotypes

Question 18

what are multiple alleles

Answer 18

Several different phenotype possibilities

Question 19

what are polygenic traits

Answer 19

Involves 2 or more genes influencing the expression of one trait

Question 20

what are sex-linked traits

Answer 20

Genes are located on the sex chromosomes

23rd pair, usually inherited on the “X”

Question 21

what are the 2 gender symbols in a pedigree

Answer 21

o=female

square= male

Question 22

what does shading mean in a pedigree and what does half shading mean

Answer 22

shading means its affected, half shading means its a carrier

Question 23

what does it mean if theres shading in every generation

Answer 23

its dominate

Question 24

how do u decide if its autosomal or sex linked

Answer 24

if males and females are shaded, its autosomal