Chapter 9 (Pt. 2) Flashcards Preview

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Flashcards in Chapter 9 (Pt. 2) Deck (20):
1

Mendel’s Dihybrid Crosses

matings btwn. individuals, differ in TWO traits studied

-determine if different genes are inherited together OR independently

2

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

different genes are inherited independently

3

Parental Types

have SAME phenotypes as individuals of P generation

4

Recombinant Types - have phenotypes that COMBINE traits of...

individuals of P generation

5

Mendel’s Principle of Independent Assortment

-genes divide into gametes INDEPENDENTLY

-results ignored until rediscovered in 1900

6

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

meiosis

genes LINKED to chromosomes

7

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

chromosome

8

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

gamete formation

9

Genes for different traits & NON homo chromosomes both...

assort INDEPENDENTLY during gamete formation

10

Gene interactions may obscure ________ ______

mendelian principles

11

Incomplete Dominance

phenotype of heterozygote may be intermediate BTWN. homozygotes

12

Codominance

2 alleles fully clear in hybrid

13

Allele A

type A sugar appears on RBC

14

Allele B

type B sugar appears on RBC

15

Allele O

NO sugar appears on RBC

16

Major Histocompatibiltiy Complex

-have multiple alleles

-divide genes

-proteins cell surface help body tell own cells from bacteria

17

After an organ transplant immune system cells...

destroy cells w/foreign proteins

18

Pleiotropy***

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

19

Genes are linked to

chromosomes

19

Expression of gene may be altered by _______

environment