Alleles are described as __________
alternate versions of a gene
Attached earlobes are recessive to free earlobes. What genotype ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?
1:1
Mendel crossed purebred purple flowered plants with purebred white flowered plants, and all of the resulting offspring produced purpler flowers. The offspring are all __________
heterozygotes and the allele for purple flower is dominant.
A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The F1 plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F1 x F1 cross?
3:1
According to Mendel’s law of segregation:
gametes have one allele copy for each gene.
An individual with the genotyp AaBb produces 4 different gametes in equal proportions. This is a demonstration of:
Mendel’s law of independent assortment
To determine the phenotype of an individual who expresses a dominant trait, you would cross that individual with an individual who is ______
homozygous recessive for that trait.
What is the basis of Mendel’s laws?
The behavior of chromosomes during Metaphase l and anaphase l of meiosis.
An individual who is homozygous:
carries two copies of the same allele for a gene
Which cross will produce only heterozygous offspring?
AA x aa
An individual with (naturally) curly hair and an individual with (naturally) straight hair mate, all of their offspring have (naturally) wavy hair. What is the relationship between the alleles for hair texture?
Incomplete dominance
Marfan syndrome is the result of an allele individuals with Marfan syndrome are tall and long limbed and have both cardiovascular and eye defects. Of what type of inheritance is the phenotype of Marfan syndrome an example?
Pleiotropy
What is best explained as being polygenic in humans?
Height
An individual heterozygous for cystic fibrosis:
is a carrier
