Answer:
25%
Explanation:
When looking at a pedigree remember that:
- squares are males
- circles are females
- the solid colored figure represents an individual affected by a disease
- the empty figure represents a healthy individual
Let us assign the symbol X⁺ to represent the dominant allele linked to the X-chromosome and expressing healthiness, and X⁻ to represent the recessive allele expressing the dissease.
According to this pedigree
- I1 is a man affected by the disease, YX⁻
- I2 is a healthy woman X⁺X⁻
- we can see that among the progeny (generation II) there are two individuals affected (a boy and a girl) and one healthy girl. This means that the mother I2 is heterozygous for the trait.
So, having their genotypes we can know what are the probabilities of getting a son with DMD
Parentals) YX⁻ x X⁺X⁻
Gametes) Y X⁻ X⁺ X⁻
Punnett square)
X⁺ X⁻
X⁻ X⁺X⁻ X⁻X⁻
Y X⁺Y X⁻Y
F1)
- The probabilities of getting a healthy daughter X⁺X⁻ are 25%
- The probabilities of getting a healthy son X⁺Y are 25%
- The probabilities of getting a daughter with DMD X⁻X⁻ are 25%
- The probabilities of getting a son with DMD X⁻Y are 25%
Valley-Glacier
Landslide-gravity
Frost wedging-ice
Canyon-river
I think this is correct, sorry if I’m wrong :)
Answer: Middle Ear
Explanation:
Ear is one of the most important part of human body by which an individual is able to hear sounds. It also helps in maintaining pressure inside body.
The Eustachian tube found inside the ear is a canal which is connects middle ear to the nasopharynx. This area consists of back of nasal cavity and the upper throat.
Its main function is to control the pressure within the middle ear, making it equal to the pressure outside the body.
Hence, the correct answer is option A
Beneficial ways: helps the spices with population
lets animals survive
Harmful ways: Kills an animal
Answer:
Throught genetics varaition. Crossing over and all
Explanation:
Becuase I said so
