Biology 2: test 2. :/

Question 1

What is it called when there are two different alleles and they both get expressed in the offspring? Example

Answer 1

Co-dominance, cows chickens, blood types a and b

Question 2

IWhat is it called when one gene blocks the xpression of all genes

Answer 2

epistasis

Question 3

How did Mendell get lucky?

Answer 3

pea plants don’t blend, there were only two options for phenotypes, all genes were located on different chromosomes which lead him to discover independent assortment

Question 4

Monohybrid vs. dihybrid

Answer 4

m: hybrids crossed looking at 1 trait. d: 2 traits

Question 5

What is it called when one gene has many effects in an organism?

Answer 5

pleiotropy

Question 6

How is skin color determined

Answer 6

polygenic inheritance

Question 7

What are these called?

Answer 7

possible genes in the male and female gametes

Question 8

What does it mean if a person is a carrier?

Answer 8

heterozygous and carry the recessive gene

Question 9

How is human blood type controlled

Answer 9

Multiple alleles

Question 10

What did the pairs of pennies represent

Answer 10

the alleles present at fertilization.

Question 11

Alelle

Answer 11

alternate forms of genes at the same time on the Homologous chromosomes

Question 12

Test cross

Answer 12

something we can do when we don’t know the genotype of an individual with a dominant phenotype. we bread it with a homozygous recessive individual and look at the offspring

Question 13

A blending of two traits is called, example

Answer 13

incomplete dominance, snapdragons

Question 14

Rabbit color is controlled by

Answer 14

genes at several locations on the chromosomes

Question 15

hybrid

Answer 15

the bringing together of 2 different things

Question 16

monohybrid cross

Answer 16

simple punnett square, crossed two parents looking at one trait

Question 17

Dihybrid cross

Answer 17

cross parents looking at 2 traits at one time, how mendel discovered independent assortment

Question 18

incomplete dominance

Answer 18

2 different genes together, there is a blending of their phenotypes

Question 19

Codominance

Answer 19

both genes are expressed fully

Question 20

Multiple Alleles

Answer 20

more than 2 possible alleles for a particular trait

Question 21

Pleiotropy

Answer 21

one gene has multiple phenotypic effects in the organism

Question 22

example of pleiotropy

Answer 22

sickle cell anemia- change in DNA, red blood cell is deformed

Question 23

Epistasis

Answer 23

a gene having an effect on the other gene effect: phenotypic expression of a gene at a second location

Question 24

Polygenic Inheritance

Answer 24

groups (at least 3) of genes working together. if all genes are dominant very very dark. if all are recessive very very white.

Question 25

Multifactoral Characters

Answer 25

traits that are effected by both genes and the environment

Question 26

pedegree

Answer 26

family history

Question 27

Amniocentesis

Answer 27

the liquid that the fetis bathes in is removed and tested

Question 28

Chlorionic Villus Sampling (CVS)

Answer 28

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