Lab 1 (Mendel) Flashcards Preview

Genetics > Lab 1 (Mendel) > Flashcards

Flashcards in Lab 1 (Mendel) Deck (17):
1

Genotype

The set of alleles possessed by an individual organism

2

Gene

An inherited factor (region of DNA) that helps determine a characteristic

3

Allele

one of two or more alternate forms of a gene

4

Heterozygote

an individual organism possessing 2 different alleles at a locus

5

Locus

Specific place on a chromosome occupied by an allele

6

Homozygote

An individual organism possessing 2 of the same alleles at a locus

7

Phenotype or trait

the appearance or manifestation of a characteristic

8

Dominant trait

traits that appear equally in both sexes and don't skip generations (A genetic trait in which one copy of the gene is sufficient to yield an outward display of the trait; dominant genes mask the presence of recessive genes; dominant traits can be inherited from a single parent.)

9

P1 Generation

Parental generation

10

F1 Generation

offspring from P1 generation. Filial 1

11

F2 Generation

Filial 2. offspring from F1 self-fertilization = MONOHYBRID or DIHYBRID

12

Dihybrid cross
Corresponds to what Law?

PpWw*PpWw
Two heterozygous that cross = ratio 9-3-3-1
Two traits/genes cross. (NO HOMOZYGOTES IN THE CROSS ARE PRESENT)
Law of independent assortment

13

Monohybrid cross
Corresponds to what Law?

Pp*Pp
One heterozygous that crosses = ration 3-1
only one trait/gene crosses. (NO HOMOZYGOTES IN THE CROSS ARE PRESENT)
Law of segregation

14

Mendel's laws

1) Law of segregation = monohybrid cross
2) Law of independent assortment = dihybrid cross

15

Law of segregation

2 Alleles encoding a trait separate in equal proportions when gametes are formed.

16

Law of independent assortment

Alleles at different loci separate independently of one another. ( separate genes for separate traits are passed independently of one another from parents to offspring)

17

Recessive trait

traits that appear equally in both sexes and tend to skip generations