Question

3. In fruit flies, two genes S and T have similar function. If either, or both...

3. In fruit flies, two genes S and T have similar function. If either, or both of the genes have at least one dominant allele present, the flies have normal wings. If not, then the wings are small. Two SsTt flies are crossed together. Assuming that the two genes assort independently, what are the expected phenotypes, and their ratios, in their offspring?

8. A male carries a recessive mutation on the X chromosome that causes hemophilia, a blood clotting disorder. He marries a female who is phenotypically normal, but whose father had hemophilia. Suppose they have a child. What is the probability that the child will have hemophilia?

Science   Biology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

8. It is a sex linked recessive diseases . In this case , female will be a carrier . She had a gene on one of X chromosome and so could pass it on her children.

If boy carries Y from father and X haemophilic from mother he will be haemophilic and nother X then it will have normal blood clotting .

If girl get X from father and X haemophilic from motjer shw will be haemophilic . And if normal from mother it will be a carrier .

For each four cases they have 25% chances . i

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
You are doing a genetics experiment with fruit flies. In your first cross, you cross two...
You are doing a genetics experiment with fruit flies. In your first cross, you cross two true-breeding flies (P generation). The female parent is brown and wingless and the male parent is black with normal wings. All of the flies in the F1 generation are brown and have normal wings. In the following questions, please indicate the alleles associated with dominant phenotypes by uppercase letters and alleles associated with recessive phenotypes by lowercase letters. Assume the genes are not found...
Question text In drosophila (fruit flies): The yellow gene is on the X-chromosome, the gene product...
Question text In drosophila (fruit flies): The yellow gene is on the X-chromosome, the gene product plays a role in body colour. Wild type flies are a light brown/tan in colour, homozygote yellow mutants have a more yellow shaded body colour. We'll use y+ to represent the wild type allele, and y to represent the mutant allele. y+ is dominant to y. The vestigial gene is on chromosome 2. Homozygote vestigial mutants have very short wings, and cannot fly. We'll...
Let’s suppose that a gene in fruit flies, which we will call gene B, follows a...
Let’s suppose that a gene in fruit flies, which we will call gene B, follows a maternal effect pattern of inheritance. A loss-of-function allele (b) is recessive and lethal. Two phenotypically normal flies were crossed and all of the offspring died during early embryonic development. What are the possible genotypes of the dead offspring’s mother, father, maternal grandmother, maternal grandfather, paternal grandmother, and paternal grandfather? Note: In some cases, more than one genotype may be possible offspring’s mother: offspring’s father:...
Grey body, normal bristle, and straight antennae are wild type in fruit flies. Black body, stubble...
Grey body, normal bristle, and straight antennae are wild type in fruit flies. Black body, stubble bristle, and twisted antennae are the corresponding mutant traits for the first isolated mutation in each of the three genes. Grey body, normal bristle, and twisted antennae are dominant. A homozygous dominant female for all three characters is crossed with a recessive male for all three characters to produce an F1 generation that is heterozygous for all three genes. An F1 male is then...
A phenotypically wilptype F1 female fruit fly that was heterozygous for genes controlling body color and...
A phenotypically wilptype F1 female fruit fly that was heterozygous for genes controlling body color and wing length was crossed to a homozygous mutant male tester with black body (mutant allele b) and vestigial wings (mutant allele vg). a. Symbolize the genotype of the dihybrid female and tester male using appropriate Drosophila gene symbolism using b+ and vg+ for the wildtype dominant alleles; b and vg for the recessive mutant alleles. b. What is the genotype of the F1 dihybrid...
In drosophila (fruit flies), eye colour is sex-linked and red eye colour is dominant to white...
In drosophila (fruit flies), eye colour is sex-linked and red eye colour is dominant to white eye colour. In a cross between a red-eyed male and a heterozygous female, what is the probability of producing white eyed female? ___________ [2 Marks] 8. Black fur in grasscutter (B) is dominant to brown fur (b.) Short tails (T) are dominant to long tails (t). What fraction of the progeny of the cross BbTt x BBtt will have black fur and long tails?...
Simple Dominance with 2 genes A gene in cats causes them to be black (dominant) or...
Simple Dominance with 2 genes A gene in cats causes them to be black (dominant) or brown (recessive). A second gene causes cats to be agouti (have stripes on their hairs) or non-agouti (solid colored hairs). If you did a dihybrid cross between two black haired agouti cats, what fraction of the offspring would be expected to have each phenotype? If a dihybrid black agouti cat mated with a brown cat that was heterozygous for the agouti gene, what fraction...
.  Eye color of the Oriental fruit fly (Bactrocera dorsalis) is determined by two genes that interact.  A...
.  Eye color of the Oriental fruit fly (Bactrocera dorsalis) is determined by two genes that interact.  A true-breeding fly having wild-type eyes is crossed with a true-breeding fly having yellow eyes.  All of the F1 flies from this cross have wild-type eyes.  When the F1 flies are interbred, 394 of the F2 progeny have wild-type eyes, 131 have amethyst (a bright, sparkling blue color) eyes and 175 have yellow eyes. a).  Based on the number of progeny produced in the cross between F1 flies,...
A student carried out a genetic investigation with fruit flies, Drosophila melanogaster. Two characteristics were observed,...
A student carried out a genetic investigation with fruit flies, Drosophila melanogaster. Two characteristics were observed, body colour and wing shape. The student had the followinginformation: the characteristics were controlled by separate genes carried on separate chromosomes grey body colour was dominant to black body colour normal wing shape was dominant to bent wing shape. The student carried out a cross between a fly heterozygous for both grey body colour and normal wing shape and a fly with a black...
23. You have two pure breeding fruit flies, with a wing shape that can be can...
23. You have two pure breeding fruit flies, with a wing shape that can be can be either normal (N) or (Vesgial) (n) and have Red Eyes or (R) or white (r).  A normal and white fly is crossed with a vestigial red eyed fly. The resulting F1 plats are crossed. A total of 640 F2 progeny are phenotypically observed: (16 Points) 360 Normal and Red 120 Normal and White 120 Vestigial and Red   40 Vestigial and White What is the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT