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girlhooper4life11
27.11.2019 •
Biology
Red/green color blindness in humans is caused by an x-linked recessive allele. if a male who is affected by the condition mates with a female who is not affected, and is also not a carrier, what percentage of their sons will have the disorder? red/green color blindness in humans is caused by an x-linked recessive allele. if a male who is affected by the condition mates with a female who is not affected, and is also not a carrier, what percentage of their sons will have the disorder?
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Ответ:
50% of the sons have the disorder.
When this couple has children, one half of their sons will have the disorder. When a male has an X-linked, recessive disorder, his genome will be YXₙ, where Xₙ represents his affected X-chromosome. Since boys can only have one X-chromosome, they cannot be carriers. Having one affected X-chromosome makes them have the condition. His wife, who is not a carrier and does not have the condition will have the genome XX. As you can see in the punnet square, this cross will lead to two sons, one of which has the color-blindness gene. So, 50% of the sons will have the disorder.
Ответ:
D: The Sun and the planet attract each other with their gravitational forces.
B:The planet speeds by the Sun with a lot of momentum.
A: The planet continues to move forward due to momentum, while the Sun’s gravity pulls the planet back.
C: The planet moves along a closed orbital path around the Sun.
Explanation:
There are 8 planets in the solar system which revolve around the sun in an elliptical orbit with sun at one of its focii. The planets are bound in the orbits around the Sun due to gravitational pull.
The Sun being heavier, the planets speeds by it with a lot of momentum. As the planet continues move forward due to momentum, the sun pulls back them due to gravity. Then, the planets move along a closed orbital path around the sun.