Chapter 9 (Pt. 1) Flashcards Preview

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Flashcards in Chapter 9 (Pt. 1) Deck (32)
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1
Q

Genetics

A

study of heredity

2
Q

Gene

A
  • unit of heredity

- part of chromosome that control traits

3
Q

Gregor Mendel

A
  • father of genetics

- austrian monk

4
Q

Blending Hypotheses Of Inheritance

A

genetic info of parents blend producing offspring of characteristics

5
Q

Mendel proposed & tested the ______ ________ __ ______ using garden peas for his experiments

A

Particulate Hypotheses of Heredity

6
Q

Pea strains showed clear…

A

alternatives traits

7
Q

Mendel controlled matings b/c peas normally…

A

self-fertilize, he could CROSS-fertilize them

8
Q

Mendel knew he could disprove BLENDING hypotheses…

A

if parental forms reappeared in offspring

9
Q

Mendel experimented with

A

14 strains of pure bred peas

10
Q

In Mendels experiment The F1 Generation showed _____ ____ of the Parental Generation but NOT the ______ trait

A

dominant trait

recessive trait

11
Q

F1=

A

parents produce

12
Q

Monohybrid Crosses

A

matings btwn. individuals differing in ONE trait studied

13
Q

Parental generation

A

generation he starts off with

14
Q

Dominant trait

A
  • may be most common

- if you have one dominant trait, your going to be dominant

15
Q

Mendel allowed F1 hybrid plants to self-fertilize…

A

producing seed for F2 Generation

16
Q

Recessive trait

A
  • CAN skip generations

- only show up if you have TWO recessive traits

17
Q

The recessive traits reappeared, but NO _______ ______ appeared, disproving the _______ hypothesis

A

intermediate traits

blending

18
Q

Mendel found most F2 generations showed approx…

A

3:1 ratio of DOMINANT : recessive traits

19
Q

Classic Mendeilian ratio

A

3:1

dominant : recessive

20
Q

Unit of Heredity

A

produced short-stemmed plants in P passed to F1 generation

21
Q

Allele

A

-alternate form of gene

22
Q

We now know genes are

A

discrete sections of chromosomes

23
Q

Each chromosome has ONE…

A

allele per gene

24
Q

Mendel decided that a hybrid has 2 different alleles, one _______ & one ______

A

dominant

recessive

25
Q

Pure breeding parents have identical _____

A

alleles

26
Q

Phenotype

A

PHYSICAL appearance of organism

27
Q

Homozygous

A
  • pure breed organisms

- pair of IDENTICAL alleles

28
Q

Genotype

A
  • genetic makeup of organism

ex. purple allele, white allele

29
Q

Heterozygous

A

-hybrids with 2 DIFFERENT alleles for trait

30
Q

Mendel’s Principal Of Segregation:

SEXUALLY reproducing diploid organisms have…

A
  • TWO copies of each gene

- split during formation of haploid GAMETES

31
Q

Mendel developed Testcross to determine genotype of…

A

organism showing dominant trait

32
Q

organisms w/ UNKOWN genotypes are crossed with…

A

Homozygous Recessive