1.If two individuals were heterozygous for freckles, which is a dominant trait,
ID: 50501 • Letter: 1
Question
1.If two individuals were heterozygous for freckles, which is a dominant trait, what percentage of their progeny would have freckles?
2.In a cross between an individual with Huntington disease (autosomal trait) and an unaffected individual, what are the chances their progeny will have the disease, considering that it is a dominant trait?
3.Many people define a person’s race based on that person’s physical characteristics, in particular, skin color. List at least three ways other than physical traits that may define a person’s race
4.How is MtDNA passed down from one generation to the next?
Explanation / Answer
Freckles are patches of melanin deposits on the body which aggravated with sun exposure. Freckles is majorly due to MC1R gene is a dominant trait. Therefore, if 2 heterozygous freckele crosses will have 75% proportion freckles in F2 There are 50% of chances that their progeny will have Huntington disease as each child gets one copy form the defective parent in either case In addition to the physical traits, behavioural traits, genetic traits and perceived traits are also the ways to define a race. Inheritance of mitochondrial DNA is maternal exclusively from mother to offspring. MtDNA is extra-nuclear. Both male and female contain MtDNA but inheritance is only from females. The mitochondrial inheritance does not follow mendelian pattern
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