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
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
Which gender has XY chromosomes?
Male/boy
A black cat (B) crosses with a white cat (W) and the offspring come out spotted. What type of dominance is this?
Codominance
A mom with AB blood type crosses with a man with O blood type. What are the genotypes of phenotypes of the offspring?
AO, BO 50/50
A Blood and B blood, 50/50
What is an organism's genotype?
Its genetic makeup, or allele combination
For example TT, Tt ,tt, BB, Bb, bb
A Red flower (RR) crosses with a white flower (WW). The offspring are all Pink (RW). Cross two pink flowers. What are the genotypes and phenotypes of the offspring?
25% RR, 50% RW, 25% WW
25% Red, 50% Pink, 25% White
A man who is colorblind marries a woman who is not colorblind. Their son is colorblind. What is the genotype of the woman? H = Normal, h - colorblind
XHXh
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.