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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All possible results of a genetic cross.
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The possible genotypes of the offspring.
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The alleles in the gametes of each parent.
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The actual genotypes of the offspring.
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Detailed explanation-1: -The parent organisms, which may come from many types or closely related species, must be genetically compatible. Thus, a Punnett square shows all of the following except the actual results of a genetic cross. Thus option 1 is correct.
Detailed explanation-2: -The different possible genotypes are AA, AO, BB, BO, AB, and OO. How are blood types related to the six genotypes? A blood test is used to determine whether the A and/or B characteristics are present in a blood sample.
Detailed explanation-3: -The Punnett square is a table in which all of the possible outcomes for a genetic cross between two individuals with known genotypes are given. In its simplest form, the Punnett square consists of a square divided into four quadrants.
Detailed explanation-4: -In addition, when a single trait is determined by multiple genes and the effect of each of these genes is graded, Punnett squares cannot accurately predict the distribution of phenotypes in the offspring.
Detailed explanation-5: -A Punnett square shows the probability of an offspring with a given genotype resulting from a cross. It does not show actual offspring. For example, the Punnett square in Figure 3 shows that there is a 25% chance that a homozygous recessive offspring will result from the cross Aa x Aa.