Question

In: Biology

In a snail, an autosomal allele causing a banded shell (b) is recessive to the allele...

In a snail, an autosomal allele causing a banded shell (b) is recessive to the allele for unbanded shell (B). Genes at a different locus on the same chromosome determine the background color of the shell; here, yellow (y) is recessive to brown (Y). The genes for shell banding and background color have a recombination frequency of 0.25. A banded, yellow snail is crossed with a homozygous brown, unbanded snail. The F1 are then crossed with banded, yellow snails (a testcross). What proportion of progeny will be banded and brown?

Solutions

Expert Solution

Answer :

Proportion of progeny banded and brown = 12.5%


Related Solutions

In Drosophila , a recessive autosomal allele, ebony (e) produces a black body colour when homozygous....
In Drosophila , a recessive autosomal allele, ebony (e) produces a black body colour when homozygous. Another recessive autosomal allele, black (b) also produces a black body colour when homozygous. Wild type flies are grey.  Flies with genotypes e/e b+/-, e+/- b/b, and e/e  b/b  show identical colour phenotype. If e/e  b+/b+ ebony flies are crossed with e+/e+ b/b black flies  than; c) What phenotypic ratios would be observed from the crosses F1 x true-breeding ebony, and F1 x true-breeding black? d) What would be...
In rabbits, black hair depends on a dominant allele, B. and brown on a recessive allele,...
In rabbits, black hair depends on a dominant allele, B. and brown on a recessive allele, b. Short hair is due to a dominant allele, S, and long hair to a recessive allele, s. A short, black haired male rabbit who is homozygous dominant for both traits is mated with a brown, long haired female a. Write the genotype (in letters) of both parents. b. Draw the Punnett square below illustrating the cross of the parental rabbits. c. What percentage...
1. you are evaluating autosomal recessive condition A (alleles A and a) and B (alleles B...
1. you are evaluating autosomal recessive condition A (alleles A and a) and B (alleles B and b) which you hypothesize are on different chromosomes. You are given 7 wildtype (homozygous dominant) female flies and 7 male flies that are homozygous recessive. What genotypic ratio would you expect in the F1 generation produced? 2. you mate the F1 females with males that are homozygous recessive for both disease A and B to produce an F2 generation. What phenotypic ratio would...
i) Researchers studying a population of tiger puppies identified a recessive single gene allele causing albino...
i) Researchers studying a population of tiger puppies identified a recessive single gene allele causing albino tiger puppies. In the population they were studying they identified 26 albino tiger puppies out of 6000 total tiger puppies. What is the predicted number of carriers in this population for this trait. ii) You sample 100 one-child families in which the mother is heterozygous for genes AB and C and the father is homozygous recessive for genes ABC and the offspring have the...
An autosomal locus has alleles A and a. The frequency of individuals with the autosomal recessive...
An autosomal locus has alleles A and a. The frequency of individuals with the autosomal recessive phenotype is given. Which statements are true? (pick all that are true) HWE= Hardy-Weinberg equilibrium 1. We can calculate q=Freq(a) even if we don't assume Hardy-Weinberg Equilibrium 2. Even if we don't assume HWE, we can calculate the genotype frequencies that we weren't given 3. If we assume HWE, we can calculate the genotype frequencies that we weren't given 4. If we assume HWE,...
Question 15 - Cystic fibrosis is transmitted as a(n): X-linked recessive gene autosomal recessive gene autosomal...
Question 15 - Cystic fibrosis is transmitted as a(n): X-linked recessive gene autosomal recessive gene autosomal dominant gene chromosomal defect
The black color cost in hamsters is due to a dominant gene (B).. A recessive allele...
The black color cost in hamsters is due to a dominant gene (B).. A recessive allele (b) at this locus results in a brown coat when homozygous (b/b). However, neither coat color is expressed when the organism is homozygous for the allele (a) at a separate locus. The a/a genotype results in a white (albino) coat, regardless of the allele at the B locus. The wild-type allele (+) at the (a) locus allows normal coat coloration, whether the genotype is...
Black body (b) and purple eye (pr) are recessive autosomal mutations in Drosophila. Bridges crossed b/b...
Black body (b) and purple eye (pr) are recessive autosomal mutations in Drosophila. Bridges crossed b/b females and pr/pr males. F2 cross produced 684 wild-type, 371 black-bodied, and 300 purple-eyes flies. Do these result indicate that the b and pr genes are closely linked? Explain. Remember that there is no crossing over in male Drosophila
Tay-Sachs disease is inherited as an autosomal recessive trait and is lethal in the homozygous recessive...
Tay-Sachs disease is inherited as an autosomal recessive trait and is lethal in the homozygous recessive condition at the age of 2years. A heterozygote marries a genotypically normal individual. What is the probability of having children that have Tay-Sachs?
Scalloped (sd) is an X linked recessive and ebony (e) is an autosomal recessive mutation. What...
Scalloped (sd) is an X linked recessive and ebony (e) is an autosomal recessive mutation. What proportion of scalloped, ebony females (relative to whole population) is expected in the F2 starting with a true breeding scalloped female which is wile type for ebony mating with a true breeding male mutant only for ebony. PLEASE break this down step by step and simplify it please. All I know is the answer is 1/16... no idea how to get it.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT