High School
SAT
ACT
University
MCAT
LSAT
DAT

If a heterozygote's phenotype lies exactly in the middle of the phenotypes of b…

Related Topics

Wize University Biology Textbook > Mendelian Genetics

More Complex Genetics [Blood Type, Pleiotropy, Epistasis and Polygenic Inheritance]

6 Activities

Wize University Biology Textbook > Mendelian Genetics

Incomplete Dominance, Co-Dominance

3 Activities

If a heterozygote's phenotype lies exactly in the middle of the phenotypes of both homozygotes, what is this called?
More More Complex Genetics [Blood Type, Pleiotropy, Epistasis and Polygenic Inheritance] Questions:
Match the non-mendelian inheritance terms with the correct definition.
Which of the follow involve 2 or more genes/loci?
Suppose a white-furred sloth breeds with a black-furred sloth. All of their offspring have
grey fur. What does this most likely tell you about the gene that codes for fur colour in
sloths?
Imagine that you are an alien scientist who has been asked to figure out why some aliens that have landed on Earth look the way they do. You see an alien child that has green skin with scales, and you follow it until it grows up and mates with a similar alien with green skin and scales (assume the same genotype). After mating the parents give rise to
many alien eggs which hatch into aliens with the following phenotypes:
21 green with scales, 7 blue with scales, 6 green without scales, and 2 blue without scales.
Suppose a white-furred sloth breeds with a black-furred sloth. All of their offspring have
grey fur. What does this most likely tell you about the gene that codes for fur colour in
sloths?
Imagine a set of genes that code for climbing speed of a sloth where there are slow, medium and fast climbers. The slow gene (S) and the fat (F) genes are the two loci that control climbing speed. If you produce a dihybrid cross of sloths from these two genes you get 9 slow, 3 medium and 4 fast. What type of interaction most likely exists between F and S?
Imagine that you are an alien scientist who has been asked to figure out why some aliens that have landed on Earth look the way they do. You an alien child that has green skin with scales, and you follow it until it grows up and mates with a similar alien with green skin and scales (assume the same genotype). After mating the parents give rise to many alien eggs which hatch into aliens with the following phenotypes:
21 green with scales, 7 blue with scales, 6 green without scales, and 2 blue without scales.
What can you conclude about the genetics surrounding alien skin appearance?
Practice: Epistasis
There are 2 genes in an alien species that have an epistatic interaction (meaning, one gene affects the expression of the other). Recessive alleles at the “bald” gene (bb) inhibit the expression of different alien antennae lengths (AL for long, AS for short and AN for no antennae where AL>AS>AN). Individuals who are homozygous recessive for the bald gene will show the AN phenotype regardless of their other antennae alleles. Individuals with at least one normal bald gene (B) express their antennae as expected from their genotype. If two parents are heterozygous for long antennae (ALAS) and heterozygous for the bald allele (Bb) mate, what is the probability that they have a child with no antennae?
There is no single gene responsible for hair loss in men, it is believed to be a combination of genes. This is an example of what?
When one character is affected by many genes this is considered what?
Genetic interactions
Two unlinked loci effect mouse hair color. BB or Bb mice are Black. Mice with genotype bb are white because all pigment production and deposition of pigment in hair is blocked. At the second locus, the A allele (black coat) is dominant to the a allele (brown coat). A mouse with a black coat is mated with a white mouse of genotype aabb. Half of the offspring are white, one quarter are black, and one quarter are brown. What is the genotype of the black parent?
More Incomplete Dominance, Co-Dominance Questions:
If you cross a red flower that is RR and another flower that is RR with a white one that is rr and all the offspring came out red and white this would an example of _____
If you cross a red flower that is RR and another flower that is RR with a white one that is rr and all the offspring came out pink this would an example of _____
In a population of fruit flies, the R allele confers regular black eye colour while the r allele produces red eye colours. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have red eyes, 90 have normal black eyes and 45 have pink eyes.
a) What type of dominance do these alleles show?
b) Is this population in Hardy-Weinberg equilibrium?
In a population of fruit flies, the R allele confers regular black eye colour while the r allele produces red eye colours. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have red eyes, 90 have normal black eyes and 45 have pink eyes.
a)What type of dominance do these alleles show?
b) Is this population in Hardy-Weinberg equilibrium?
In a population of fruit flies, the R allele confers regular black eye colour while the r allele produces red eye colours. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have red eyes, 90 have normal black eyes and 45 have pink eyes.
a) What type of dominance do these alleles show?
b) Is this population in Hardy-Weinberg equilibrium?
Assume the following dihybrid crosses where for a particular gene, A represents the dominant allele and a, the recessive allele, and for another trait, B represents the dominant allele and b, the recessive allele. Genes show complete dominance.
Assume the following dihybrid crosses where for a particular gene, A represents the dominant allele and a, the recessive allele, and for another trait, B represents the dominant allele and b, the recessive allele. Genes show complete dominance.
Practice: Multi-loci Crosses
A beetle species has the following genetic relationships:
Wing length - long (L) is sex-linked dominant to short (l) on the D chromosome
Wing colour - Blue (B) is co-dominant with black and makes purple wings (P) which are dominant to white (b)
In a population of fruit flies, the R allele confers regular red eye colour while the r allele produces white eye colours. The R gene produces a red pigment, the recessive allele of this gene (r) is nonfunctional. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have white eyes, 90 have normal red eyes and 45 have pink eyes.
Which of the follow does not result in a departure from Hardy-Weinberg equalibrium?
Imagine a set of genes that code for climbing speed of a sloth where there are slow, medium and fast climbers. The slow gene (S) and the fat (F) genes are the two loci that control climbing speed. If you produce a dihybrid cross of sloths from these two genes you get 9 slow, 3 medium and 4 fast.
What genotype would produce a sloth that climbs at medium speed?
What is unique about incomplete dominance?
We crossed a red flower (RR) with a white flower (rr) and the result was a progeny of pink flowers. We crossed flowers of F1 with white flowers (rr) and the result with brighter pink flowers, which of the following is the principle that best explains this experiment?