biology

posted by .

A dominant gene V in humans causes certain areas of the skin to become depigmented, a condition called "vitiligo." Albinism is the complete lack of pigment production and is produced by the recessive genotype aa. The albino locus is epistatic to the vitiligo locus. Another gene locus, the action of which is independent of the previously mentioned loci, is known to be involved in a mildly anemic condition called "thalassemia." (a) When the adult progeny from parents both of whom exhibit vitiligo and a mild anemia is examined, the following phenotypic proportions are observed : 1/16 normal : 3/16 vitiligo : 1/8 mildly anemic : 1/12 albino : 3/8 vitiligo and mildly anemic : 1/6 albino and mildly anemic. What is the mode of genetic action of the gene for thalassemia? (b) What percentage of the viable albino offspring in part (a) would carry the gene for vitiligo? (c) What percentage of viable offspring with symptoms of mild anemia also show vitiligo?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Biology

    Populations are frequently NOT in equilibrium due to selection or other evolutionary forces. Imagine a population of 100 individuals. Forty-nine of the individuals are homozygous dominant for beady-eye gene, 9 are heterozygous and …
  2. Science - biology - university

    A couple where both the man and woman are albino decided to have children. Remember that albinism is inherited as a rare autosomal recessive trait. To their surprise their first child had normal skin pigmentation. They eventually have …
  3. Biology

    Typically we talk about blood types as B-positive or AB-negative and so forth. The positive and negative part of the blood type is determined by a completely separate gene (the Rh locus). The ABO locus and the Rh locus are inherited …
  4. Genetics

    A certain form of albinism in humans is recessive and autosomal. Assume that 1% of the individuals in a given population are albino. Assuming that the population is in Hardy-Weinberg equilibrium, what percentage of the individuals …
  5. Genetics

    A certain form of albinism in humans is recessive and autosomal. Assume that 1% of the individuals in a given population are albino. Assuming that the population is in Hardy-Weinberg equilibrium, what percentage of the individuals …
  6. 7th grade science

    1. How many chromosomes do human sex cells have?
  7. 7th grade science ASAP

    1. How many chromosomes do human sex cells have?
  8. Genetics

    Albinism is inherited as a simple recessive trait. If a woman and her husband are both heterozygous for albinism then what is the probability that their first five children will have these phenotypes?
  9. BIOLOGY - HELP URGENT!!!!

    How do the following terms relate to one another with respect to a single genetic locus?
  10. biology

    Albinism (lack of pigment) is caused by a recessive allele in humans. If normal parents have an albino child, what is the probability that their next child will be normal for pigment?

More Similar Questions