A plant that produces white flowers is crossed to a plant that produces orange flowers. All the offspring produced pale orange flowers. What can you conclude?
This trait shows incomplete dominance.
Why do X-linked conditions appear more frequently in males than"in females?
male with a nonfunctioning allele on X does not have another allele of that gene.
a diploid cell from an organism has 32 chromosomes, how many would be in a gamete that is the result of non-disjunction.
31 or 33
A, B, and 0 blood type in humans is controlled by a single gene with three alleles: I to power of (A), I to power of (B) and i
I to the power of (A)i and I to the power of (B) i
If a 2n cell with 6 chromosomes undergoes mitosis how many chromosomes will each daughter cell have?
In humans, "unattached" earlobes are dominant over "attached" earlobes. "Widows peak" hairline is dominant over
"non-widows peak" hairline. Use E and e for the earlobe phenotype alleles, and Wand w for the hairline phenotype alleles. Dimpled cheeks is dominant to undimpled cheeks. If there exists a 50% chance that a child will
have dimpled cheeks, the parental genotypes must be
C Dd and dd
What is one of the differences between cell division in plants and cell division in animal cells?
Plant cells separate by a growth of a cell wall and membrane in the middle of the cell
In a dihybrid cross, if heterozygotes are crossed, what fraction of the offspring are expected to have
both the dominant phenotypes?
In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y
for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. If a YyPp plant is crossed to a Yypp plant, what is the probability that the resulting plant will have
the genotype Yypp?
What is the relationship between genes and chromosomes?
chromosome is a DNA molecule with many genes .
if a cell with 2 nuclei was discovered, which of the explanations below would be true?
Mitosis occurred without cytokinesis.
what is the function of DNA polymerase?
matching complementary bases on nucleotides during DNA replication
A female who does not carry the color blindness allele has children with a male who is color blind.
What proportion of their children will be color blind?
What is one of the main differences between somatic cells and gametes?
gametes will fuse to produce offspring.
in cell division, when are mitochondria, lysosomes, ribosomes and other cytosolic cell components divided?
Mendel postulated that individuals have "elements in pairs " that determine a single phenotype. What are the paired elements?
2 alleles of a gene on homologous chromosomes
One strand of DNA is the template for the synthesis of another strand. What does this mean?
the template specifies the bases on the nucleotides of the strand being made.
why does ova production result in one egg and three polar bodies?
This allows the egg to receive most of the cytoplasm.
how many different types of bases are used to encode all the genetic information in a molecule of DNA?
The plant Arabidopsis thalian has five pairs of chromosomes AA, BB, CC, DD and EE. If this plant is
self-fertilized, what chromosome complement would be found in a root cell of the offspring?
AA, BB, CC, DD, EE
If a female who is a carrier for the hemophilia gene has a child with a male who does not have
hemophilia, which prediction is correct?
if of the sons and none of the daughters will have hemophilia.
What is the purpose of recombination (crossing over)?
create chromosomes that are a new combination of paternal and maternal material
The two strands of a double helix of DNA are linked by what kinds of bonds?
hydrogen bonds between sugars and phosphates
If a eukaryotic cell has 20 chromosomes and it undergoes meiosis, how many cells will result, and
how many chromosomes will they contain?·
4 cells, each with 10 chromosomes
A person who is heterozygous for the Huntington disease allele has offspring with someone who
does not have HD. What proportion of their children will have HD?
AA and Aa