Genetics 1
Pea Plants
The type of allele in whose trait always shows up in the organism if the allele is present
dominant allele
A cross with a Tt (tall) pea plant and another tt pea plant will result in what probability for a short pea plant?
50%
An organism with two different alleles for a trait is called what?
heterozygous
What is the study of heredity?
Genetics
Physical characteristics are called
traits/phenotypes
The type of allele that can be masked, or covered up
recessive allele
A cross with a BB (black guinea pig) and a bb (white guinea pig) will result in what probability of a white guinea pig?
0%
name of the Genotype if an organism's is TT
Homozygous dominant
What are pedigrees used for?
To track certain traits through a family
Humans have a total of __ chromosomes
46
Where are chromosomes located?
Nucleus of cells
What is an organism's genotype?
Its genetic makeup, or allele combination
For example TT, Tt ,tt, BB, Bb, bb
The name of the genotype if an organism's is hybrid.
heterozygous
If there is a recessive trait being looked at, would it show up in every generation of a pedigree?
No it can be carried
Factors that control traits are called
genes
A chart that shows all the possible combinations of alleles that can result from a genetic cross
Punnett square
What is an organism's phenotype?
Its physical appearance or traits
( For example a tall pea plant or a black guinea pig)
Possible letter code if the organism is purebred for the recessive trait.
bb (or any other letter as long as both are lowercase).
The monk who performed experiments on pea plants, known as the father of genetics
Gregor Mendel
The different forms of a gene are called
alleles
The likelihood that an event will occur
Probability
An organism with two identical alleles is called what?
homozygous
Which is considered the phenotype?
Mm, rr. TT OR blonde vs brown hair
blonde hair vs brown hair
What are the genotypes for each parent if 1/4 of the offspring in a punnett square is homozygous recessive?
Both heterozygous.