Lecture 14 Flashcards Preview

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Flashcards in Lecture 14 Deck (21):
1

alleles

Any of the alternative versions of a gene that may produce distinguishable phenotypic effects.

2

codominance

2 dominant alleles

3

dihybrid cross

crossing 2 hybrid's. Tall and short, Tall and short.

4

dominant allele

The allele that will show it's trait over recessive alleles

5

F1 generation

The first filial, hybrid (heterozygous)
offspring arising from a parental (P
generation) cross.

6

F2 generation

The offspring resulting from
interbreeding (or self-pollination) of the hybrid
F1 generation.

7

genotype

The genetic makeup, or
set of alleles, of an organism.

8

heterozygous

Dominant and recessive alleless

9

homozygous

only dominant or only recessive alleles

10

incomplete dominance

when co dominance relates in an intermediate trait. I.e. pink instead of red or white.

11

law of independent assortment

Mendel?s
second law, stating that each pair of alleles
segregates, or assorts, independently of each
other pair during gamete formation; applies
when genes for two characters are located
on different pairs of homologous chromosomes
or when they are far enough apart on
the same chromosome to behave as though
they are on different chromosomes.

12

law of segregation

Mendel?s first law, stating
that the two alleles in a pair segregate (separate
from each other) into different gametes
during gamete formation.

13

monohybrid cross

crossing 1 hybrid.

14

P generation

parental generation

15

pedigree

A diagram of a family tree with
conventional symbols, showing the occurrence
of heritable characters in parents and
offspring over multiple generations.

16

phenotype

The observable physical
and physiological traits of an organism,
which are determined by its genetic makeup.

17

pleiotropy

The ability of a
single gene to have multiple effects.

18

polygenic inheritance

An
additive effect of two or more genes on a
single phenotypic character.

19

Punnett square

tool to aid in crossing

20

recessive allele

will only reveal it's trait if no dominant traits are present.

21

trait

the ovservable result of a combination of alleles.