GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Only recessive alleles are inherited from homozygous parents.
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Dominant alleles grow weaker as they are passed from parents to offspring.
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Only the parent with a dominant allele can pass that allele to offspring in sexual reproduction.
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A heterozygous parent has an equal chance of passing either the dominant allele or the recessive allele to offspring.
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Detailed explanation-1: -Based on this, during meiosis or gamete formation, an heterozygous dog (Ss) will produce gametes with the short hair allele (S) and long hair allele (s) in equal proportion i.e. 50-50.
Detailed explanation-2: -The allele for short hair (L) is dominant to the allele for long hair (1). A cross of heterozygous two short-haired dogs produces six short-haired and two long-haired offspring.
Detailed explanation-3: -Short hair is dominant which means it can express in both heterozygous(Hh) and homozygous condition(HH). If all the progeny have short hair, then the parents should have been either: HH x HH OR HH x Hh OR HH x hh.
Detailed explanation-4: -Since the parents are both heterozygous for hair length, their offspring is expected to be 50% heterozygous for hair length.
Detailed explanation-5: -Which of the following best explains how the insertion mutation affects the hair length of the dogs? The mutation results in the loss of a protein that is normally present in hair. Answer A: The mutation results in the loss of a protein that is normally present in hair.