Dominant vs. Recessive Traits
If an organism has two recessive alleles, what kind of trait will it show?
: a recessive trait
what is a gene
segment of DNA that controls trait
what is a punnetsquare used for
to predict offspring traits
if TT is crossed with TT what percent of offspring will be TT
100%
genotype of an organism with two dominant alleles
homozygous dominants
In the genotype Bb, which allele is dominant?
B
what is a trait
characteristic passed from parents to offspring
how many boxes are in a basic punnet square
4
if Tt is crossed with Tt how wany possible genotypes are there
3
TT tt Tt
genotype of an organism with two recessive alleles
homozygous recessive
True or False: A recessive trait can only appear if both alleles are recessive.
true
what is DNA
molecule that carries genetic info
what goes along top and sides of punnet square
parents alleles
in a TtxTt cross what percent are tt
25%
genotype of an organism with one dominant allele and one recessive
heterozygous
Which type of allele masks another allele?
dominant allele
what do we call an organisms genetic makeup
genotype
what do boxes inside punnet squares represent
possible offspring genotypes
in a Ttxtt cross what percent are Tt
50%
if purple flowers P, are dominant over white flowers p, what is the phenotype of a Pp flower
purple flower
A person with genotype TT is described as:
homozygous dominant
organisms physical apperence
phenotype
what do punnet squares help scientists calculate
probability of traits in offspring
if BB is crossed with bb what percent of offspring are Bb
100%
In a cross of AaxAa what percent of offspring will show the dominant phenotype
75%