Chapter 9 (Pt. 2) Flashcards Preview

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

Mendel’s Dihybrid Crosses

A

matings btwn. individuals, differ in TWO traits studied

-determine if different genes are inherited together OR independently

2
Q

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

A

different genes are inherited independently

3
Q

Parental Types

A

have SAME phenotypes as individuals of P generation

4
Q

Recombinant Types - have phenotypes that COMBINE traits of…

A

individuals of P generation

5
Q

Mendel’s Principle of Independent Assortment

A
  • genes divide into gametes INDEPENDENTLY

- results ignored until rediscovered in 1900

6
Q

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

A

meiosis

genes LINKED to chromosomes

7
Q

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

A

chromosome

8
Q

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

A

gamete formation

9
Q

Genes for different traits & NON homo chromosomes both…

A

assort INDEPENDENTLY during gamete formation

10
Q

Gene interactions may obscure ________ ______

A

mendelian principles

11
Q

Incomplete Dominance

A

phenotype of heterozygote may be intermediate BTWN. homozygotes

12
Q

Codominance

A

2 alleles fully clear in hybrid

13
Q

Allele A

A

type A sugar appears on RBC

14
Q

Allele B

A

type B sugar appears on RBC

15
Q

Allele O

A

NO sugar appears on RBC

16
Q

Major Histocompatibiltiy Complex

A
  • have multiple alleles
  • divide genes
  • proteins cell surface help body tell own cells from bacteria
17
Q

After an organ transplant immune system cells…

A

destroy cells w/foreign proteins

18
Q

Pleiotropy***

A
  • SINGLE gene may determine many different PHENOTYPIC traits
    ex. white tigers,
19
Q

Genes are linked to

A

chromosomes

19
Q

Expression of gene may be altered by _______

A

environment