Chapter 9 (Pt. 2)

Question 1

Mendel’s Dihybrid Crosses

Answer 1

matings btwn. individuals, differ in TWO traits studied

-determine if different genes are inherited together OR independently

Question 2

9:3:3:1 ratio of phenotypes observed in F2 generation convinced Mendel…

Answer 2

different genes are inherited independently

Question 3

Parental Types

Answer 3

have SAME phenotypes as individuals of P generation

Question 4

Recombinant Types - have phenotypes that COMBINE traits of…

Answer 4

individuals of P generation

Question 5

Mendel’s Principle of Independent Assortment

Answer 5

• genes divide into gametes INDEPENDENTLY

- results ignored until rediscovered in 1900

Question 6

Scientists discovered parallels btwn. distribution of chromosomes during ______ & the inheritance of genes, suggesting….

Answer 6

meiosis

genes LINKED to chromosomes

Question 7

Each body cell has 2 copies of each GENE & 2 copies of each __________

Answer 7

chromosome

Question 8

Pairs of alleles & pairs of homo chromosomes both segregate during ______ ______

Answer 8

gamete formation

Question 9

Genes for different traits & NON homo chromosomes both…

Answer 9

assort INDEPENDENTLY during gamete formation

Question 10

Gene interactions may obscure ________ ______

Answer 10

mendelian principles

Question 11

Incomplete Dominance

Answer 11

phenotype of heterozygote may be intermediate BTWN. homozygotes

Question 12

Codominance

Answer 12

2 alleles fully clear in hybrid

Question 13

Allele A

Answer 13

type A sugar appears on RBC

Question 14

Allele B

Answer 14

type B sugar appears on RBC

Question 15

Allele O

Answer 15

NO sugar appears on RBC

Question 16

Major Histocompatibiltiy Complex

Answer 16

• have multiple alleles
• divide genes
• proteins cell surface help body tell own cells from bacteria

Question 17

After an organ transplant immune system cells…

Answer 17

destroy cells w/foreign proteins

Question 18

Pleiotropy***

Answer 18

• SINGLE gene may determine many different PHENOTYPIC traits
  ex. white tigers,

Question 19

Genes are linked to

Answer 19

chromosomes

Question 19

Expression of gene may be altered by _______

Answer 19

environment