Genetics Questions

In a certain species of plant, flowers occur in three colors: blue, pink, and white. A pure-breeding pink plant is mated with a pure-breeding white plant. All of the F1 are blue. When the blue F1 plants are selfed, the F2 occur in the ratio 9 blue:3 pink:4 white. How many gene pairs control the flower color phenotype?

The R locus determines flower color in a new plant species. Plants that are genotype RR have red flowers, and plants that are rr have white flowers. However, Rr plants have pink flowers. What type of inheritance does this demonstrate for flower color in these plants?

Coat color is determined by two loci in large cats. Two pink panthers fall in love and produce a large litter of baby panthers with the following phenotypic ratios: 12/16 pink; 3/16 black; and 1/16 white. What is the genotype of the pink progeny?

In the attached pedigree, how do you know that this trait is sex linked?

Hair color, skin color, and eye color are examples of what type of traits?

What do humans pass on to their children?

A professor wants to determine the mode of inheritance in mice fur. She crosses a brown mouse with a white mouse and the babies are white with brown patches of fur. What mode of inheritance is this?

In guinea pigs, the allele for rough coat (R) is dominant over the allele for smooth coat (r). A heterozygous guinea pig (Rr) and a homozygous recessive guinea pig (rr) have nine offspring. When drawing a Punnett square for this cross it shows that 50% of the offspring can have rough coats and 50% can have smooth coats. Knowing this, how is it possible for all of the offspring (100%) to have smooth coats?

What type of dominance is created when the dominant allele covers up the recessive allele?

A child has colorblindness. Which genotype-phenotype combination is NOT possible in the child's parents?

A professor wants to determine the mode of inheritance in flowers. She crosses a red flower with a yellow flower and the flowers all come out orange. What mode of inheritance is this?

____________________ is an example of a trait that is controlled by multiple alleles for a single gene, whereas _______________ is controlled by many different genes.

What does A match up with in RNA?

In sheep, the allele for white wool (A) is dominant over the allele for black wool (a). How would you determine the genotype of a white sheep?

About what percent of human's DNA is active?

`Recessive traits are expressed in individuals that:possess the same allele on both chromosomespossess the one allele on one chromosome and a different allele on the otherdisplay the phenotype that is smallerlack the allele entirely

In a mating of a BB and Bb individual, what is the expected ratio of genotypes in the offspring (assume B is dominant to b).1:2:13:11:12:1

A codon includes _____ nucleotides.1234

Homozygous individuals have:different alleles at the locussame alleles at the locusthree different alleles at a locusbrown eyes

What percentage of the genes in bananas do humans share?