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31 Cards in this Set

  • Front
  • Back
Mendel concluded that traits are
inherited through the passing of factors from parents to offspring
When Mendel crossed true-breeding tall plants with true-breeding short plants, all the offspring were tall because
the allele for tall plants is dominant
If an organism's diploid number is 12, its haploid number is
Chromosomes form tetrads during
prophase of meiosis I
Unlike mitosis, meiosis results in the formation of
four genetically different haploid cells
Gregor Mendel used pea plants to study
the inheritance of traits
Two plants with the genotypes TT and Tt would have the same
Organisms that have two identical alleles for a particular trait are said to be
Situations in which one allele for a gene is not completely dominant over another allele for that gene are called
incomplete dominance
Mendel's principles of genetics apply to
all organisms
Gametes are produced by the process of
Unlike mitosis, meiosis results in the formation of
haploid cells
Traits that are produced by the interaction of several genes are said to be
A female's sex chromosomes are
In a specific set of pelicans, the gene for white-tipped wings is dominant over the gene for grey-tipped wings. If a pelican with a genotype of Ww mated with a pelican wit ha genotype WW, what is the probability that the offspring will have grey-tipped wings?
In certain orchids, the gene for solid-colored petals is dominant over the gene for multicolored petals. If two orchids with multicolored petals produce offspring, what is the probability that the offspring will have multicolored petals?
What is the probability of an offspring having the genotype PP, if one parent has the genotypes PP and the other has the genotype Pp?
What is the probability that an offspring will express the recessive trait if the parent's genotypes are both Tt?
Where are sex-linked traits located?
on the X and/or Y chromosomes
In blood types, both alleles are fully expressed and show no dominance over the other. This is an example of?
Incomplete dominance will cause
a mixture of the two traits
The skin color of a human may have a genotype of WwDDRr. What kinds of trait is this?
a polygenic trait
Why is a male more likely than a female to be color blind?
because colorblindness is a recessive trait carried on the X chromosome
A pea plant that has 2 different alleles for the same trait is said to be ____.
An organism's gametes have ____ the number of chromosomes found in the organism's body cells
The different forms of a gene are called_____.
_____are most likely to suffer from a sex-linked disorder because they have only one X.
A female who does not possess a given trait, but can pass it on to her offspring is called a _____.
How many recessive alleles for a trait must an organism inherit in order to show that trait?
Define homologous chromosomes.
corresponding sets of chromosomes; one set inherited from the male parent and the other set inherited from the female parent.
Explain the difference between incomplete dominance and codominance.
incomplete dominance--one allele is not completely dominant over the other. As a result, the heterozygous phenotype is somewhere between the 2 homozygous phenotypes
Codominance--both alleles contribute to the phenotype of an organism. As a result, the heterozygous phenotypes shows both homozygous phenotypes