Question

Tail length in salamanders is controlled by a sex-linked gene. The heterozygous condition gives tails intermediate...

Tail length in salamanders is controlled by a sex-linked gene. The heterozygous condition gives tails intermediate in length, whereas long and short tailed individuals are homozygous.

a. What phenotypic ratio is expected from a cross of a long-tailed male and an intermediate-tailed female?

b. In addition to sex-linked inheritance, what kind of inheritance is illustrated here? Is it incomplete dominance or codominance? Explain.

Homework Answers

Answer #1

Let XL encodes long tail. And Xl encodes short tail.

A) Parents: XL Y ( long tailed male) × XL Xl ( intermediate tail female)

Punnet square:

Gametes XL Xl
XL XL XL ( long tailed daughter) XL Xl ( intermediate tailed daughter)
Y XL Y ( Long tailed son) Xl Y ( short tailed son)

Phenotypic ratio: Long tailed (2): Intermediate tailed (1) : short tailed (1)

-----

B) This is the case of incomplet type inheritance. Because there are found incomplete dominance of XL allele over Xl allele. Because the XL Xl genotype encodes intermediate tailed inheritance.

----.

Please rate high.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
In mice, coat colour and tail length are controlled by two linked genes: B = Black,...
In mice, coat colour and tail length are controlled by two linked genes: B = Black, b = brown; and T = long tailed, t = short tailed. A testcross was carried out using a heterozygous black, long tailed mouse, and the following progeny were observed: 7 Black, long-tailed 18 Black, short-tailed 20 Brown, long-tailed 5 Brown, short-tailed a)      What is the recombination frequency between the B and T genes? b)      What is the map distance between the B and...
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?...
For problem 1, to compute probabilities, the probability of event 1 AND event 2 is obtained...
For problem 1, to compute probabilities, the probability of event 1 AND event 2 is obtained by multiplying the two probabilities together, whereas the probability of event 1 OR event 2 is obtained by adding the two probabilities. 1. Duchenne muscular dystrophy (DMD) is a condition that causes muscle degeneration and then death. Most people with the condition are wheelchair-bound by age 12 and dead before age 30. The condition is due to a mutation in the gene for a...
For problem 1, to compute probabilities, the probability of event 1 AND event 2 is obtained...
For problem 1, to compute probabilities, the probability of event 1 AND event 2 is obtained by multiplying the two probabilities together, whereas the probability of event 1 OR event 2 is obtained by adding the two probabilities. 1.   Duchenne muscular dystrophy (DMD) is a condition that causes muscle degeneration and then death. Most people with the condition are wheelchair-bound by age 12 and dead before age 30.      The condition is due to a mutation in the gene for...
1) In cattle, there is no dominance between the alleles for red coat (W) and white...
1) In cattle, there is no dominance between the alleles for red coat (W) and white coat (c). The heterozygote is intermediate or "roan" in color. a) Give the genotypic and phenotypic ratios to be expected following a mating between two roan animals. b) What are the expected genotypic and phenotypic ratios from a cross between a roan animal and a white one? 2) In cattle, the hornless condition (H) is dominant to that for the possession of horns (h)....
For problem 1, to compute probabilities, the probability of event 1 AND event 2 is obtained...
For problem 1, to compute probabilities, the probability of event 1 AND event 2 is obtained by multiplying the two probabilities together, whereas the probability of event 1 OR event 2 is obtained by adding the two probabilities. 1.​Duchenne muscular dystrophy (DMD) is a condition that causes muscle degeneration and then death. Most people with the condition are wheelchair-bound by age 12 and dead before age 30. ​The condition is due to a mutation in the gene for a protein,...
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...
1.Which of the following is TRUE? a) Genetics is about the genotype. b)Inheritance is controlled by...
1.Which of the following is TRUE? a) Genetics is about the genotype. b)Inheritance is controlled by factors and each offspring receives three factors from each parent. c)Allele pairs never segregate from one another. d)The principle of segregation states that genes for different traits assort independently of one another in the formation of gametes. e)Independent assortment of two traits shows a F2 generation that has a 9:3:3:1 phenotypic ratio. 2.A cross between a black rabbit (BB) and a white rabbit (bb)...
Match the term to the description. Ex 1 = E Terms 1. Alagille                                &n
Match the term to the description. Ex 1 = E Terms 1. Alagille                                                                             Cystic Fibrosis Cri du chat Sickle Cell disease klinefelter syndrome WilliamSyndrome Jacob’s Syndrome X-linked Poly-X female Trisomy 21 Gene Linkage Down Syndrome Turner’s Syndrome Deletion Inversion Duplication 17.Fragile x syndrome 18.Hemophilia   Muscular Dystrophy Color blindness   Achondroplasia independent assortment Huntington Neurofibromatosis 25.Phenylketonuria Tay-Sachs Burkett lymphoma Mendel’s Law of Segregation Mendel’s Law of Independent Assortment Incomplete Dominance Multiple Allelic Traits 32.Polygenic Inheritance 33.Polyploidy 34.Aneuploidy Amniocentesis Chorionic Villi Sampling...