Answer:
X-linked/Sex-linked recessive inheritance
Explanation:
<em>The most likely mode of inheritance of the trait is an X-linked recessive inheritance.</em>
The sex chromosome of a male is XY while that of a female is XX. The Y chromosome is hypothesized not to carry any allele ordinarily. Hence, a male child only needs to inherit one affected allele to become affected for recessive X-linked traits.
During gamete formation, the sex chromosome of the male segregates into X and Y gametes while that of the female segregates into X and X gametes. During fertilization, the X gamete of the male is usually inherited by the female while one of the X gametes of the female is usually inherited by the male.
<u>Assuming a father is affected for an X-linked recessive trait, the affected X chromosome will be passed to a female child and such a child would be a carrier, rather than being affected since she requires the two X chromosomes to be affected in order to exhibit the trait. </u>
<u>The affected X chromosome is thus passed to her male child according to the law of inheritance of the sex chromosome. Hence, the grandson of the affected man inherits the trait through the daughter of the affected man.</u>
First law of genetics....
Proteins, carbohydrates, nucleic acids, and lipids
Answer: The correct answer is D. Heating by the sun.
Comets are balls composed of dust and ice orbiting around the Sun in elliptical orbits. The orbit of the comet takes it near and far away from the sun. As the comets get closer to the Sun, the heat of the sun vaporizes the materials on the surface of the comet which forms a tail pointing away from the sun.
A comet tail is visible from Earth when they are illuminated by the Sun on approaching the inner Solar System. The solar radiations vaporize the volatile materials of the comet which streams out from the nucleus and carries dust away with it. The pressure due to the Sun’s radiation and solar winds leads to the formation of a tail pointing away from the Sun.
Answer:
It occurred in the mother and in meiosis II stage
Explanation:
A karyotype shows that a child has Klinefelter syndrome (47,XXY) which involves a male child having an XXY chromosome in which the XX chromosome codes from the mother.
If the child is also color-blind (due to a recessive X-linked allele), despite his parents having normal color vision then the nondisjunction occurred in meiosis II because sister chromatids separate during meiosis II and the non separation is the reason for the Klinefelter syndrome.
