Question

Haemophilia is more common in males because it is a (a) recessive character carried by Y-chromosome...

Haemophilia is more common in males because it is a

(a) recessive character carried by Y-chromosome

(b) dominant character carried by Y-chromosome

(c) dominant trait carried by X-chromosome

(d) recessive trait carried by X-chromosome.

Science   Biology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

Answer: (d) recessive trait carried by X-chromosome.

The males are more affected because they have only one X chromosome. In females, if one X chromosome has a mutation causing haemophilia but another X has no mutation then it can produce the necessary clotting factors (i.e.factor VIII and IX). And they can cancel the effect of hemophilic mutation of the first X chromosome.

But there is no other X in males to produce clotting factors. So males are more affected.

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
Why do affected males of X-linked traits not pass down the trait to their sons? a.)...
Why do affected males of X-linked traits not pass down the trait to their sons? a.) males are more sensitive to mutations than females b.) males have one X chromosome c.) males are not predominantly affected d.) males transmit their Y chromosome to their sons
a) Are recessive alleles always more common than dominant alleles? b) Explain why the Osteogenesis imperfecta...
a) Are recessive alleles always more common than dominant alleles? b) Explain why the Osteogenesis imperfecta (OI) allele is rare even though the (OI) allele is a dominant trait which means only one copy is necessary to show the disease phenotype?
In a cross between a white-eyed female with two X chromosomes and one Y chromosome (XwXwY)...
In a cross between a white-eyed female with two X chromosomes and one Y chromosome (XwXwY) with a red-eyed male, the majority of the males have white eyes and the majority of the females have red eyes. However, rare red-eyed males and white-eyed females are present as well. What is the most likely chromosomal constitution of the red-eyed males and white-eyed females resulting from this cross? Notes: Xw is recessive (white) and X+ is dominant (red). The answer is not...
1) One parent has yellow flowers, which is the dominant allele Y. The second parent has...
1) One parent has yellow flowers, which is the dominant allele Y. The second parent has white flowers, the recessive allele y. If the offspring are all yellow, what is the genotype of each parent? 2) A plant is homozygous for the recessive gene "a" causing the plant to be short. What is the genotype and the phenotype of this plant? (In your answer, be very clear about which is the genotype and which is the phenotype). 3) The allele...
6. Red-green color blindness occurs in about 8% of males and .4% of females. Many genes...
6. Red-green color blindness occurs in about 8% of males and .4% of females. Many genes contribute to Red-green colorblindness and most of these are sex-linked, which is the reason for the disparity in the frequency between males and females. Call the allele that encodes a functional product "+" and the allele that encodes a non-functional product "=". Why is Red-green color blindness more fequent in males? a.   because males inherit only a single X chromosome, which means that inheriting...
QUESTION 19 A study has shown that if adoptive parents develop asthma, then their adopted child...
QUESTION 19 A study has shown that if adoptive parents develop asthma, then their adopted child is more likely to have asthma. This suggests that asthma is linked strongly to a genetic component. an environmental component. QUESTION 20 Most pedigrees showing the hypothetical human trait show the following characteristics: • Only males are affected. • Affected fathers always pass the trait to sons. What is the MOST likely mode of inheritance for this disorder? A. Y-linked B. X-linked dominant C....
Consider the cross X ^(v+ cv+ y+) / X ^(v+ cv+ y+) X X ^(v cv...
Consider the cross X ^(v+ cv+ y+) / X ^(v+ cv+ y+) X X ^(v cv y)/ Y Female homozygous dominant for all; male homozygous recessive for all alleles v=vermillion eyes (recessive) cv=crossveinless wings (recessive) y=yellow body (recessive) A) find F1 genotypes for females B) find F1 genotypes for males C) find F1 phenotypes for females D) find F1 phenotypes for males
1. A child will be a girl if * it receives an X chromosome and a...
1. A child will be a girl if * it receives an X chromosome and a Y chromosome from its mother it receives a Y chromosome from its mother it receives an X chromosome from its father it receives a Y chromosome from its father 2.When black rabbits mate with white rabbits, all of the offspring come out gray. This is an example of * incomplete dominance a sex linked disorder an autosomal (chromosomes 1-22) recessive disorder simple dominance 3.Mendel...
The white eyes w gene of Drosophila is located on the X chromosome. A fly will...
The white eyes w gene of Drosophila is located on the X chromosome. A fly will be ‘hemizygous’ for the w gene if it has which karyotype? Group of answer choices XX XXY XY Which of the following determines the correct segregation of X and Y chromosomes during meiosis I in humans (males): Group of answer choices Lack of homology between X and Y Presence of “pseudoautosomal” (PAR) regions shared by X and Y The presence of the SRY gene...
For the trait hemophilia, individuals can inherit dominant alleles (normal blood clotting) or recessive alleles (hemophilia—cannot...
For the trait hemophilia, individuals can inherit dominant alleles (normal blood clotting) or recessive alleles (hemophilia—cannot clot blood). Heterozygousindividuals are carriers for this trait, meaning they have the recessive allele in their cells, but do not express hemophilia. Which of the following BEST explains why these individuals do not express the trait? Group of answer choices One of a female’s X chromosomes is inactivated in every cell as dosage compensation. Females are the heterogametic sex in humans, while females are...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT