Question

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The Punnett square is a chart used to predict an results of a genetic cross It is used to determine the probability of the occurrence of each genotype among offspring. The Punnett square shows every possible combination for a specific cross of maternal and paternal genotypes

Answer 1

From the punnet square it can be identified that,

R- dominant allele(red)

r- recessive allele(white)

Rr- heterozygous red

RR-homozygous red

rr-homozygous white

It is a monohybrid cross because it is a cross between paternal and maternal genotypes possessing a pair of contrast characters.

Answer 2

In this case, the Punnett square evidences a genetic cross between two heterozygous individuals and genotypic frequencies we can expect from this cross.

• The Punnett square is a graphical representation used to determine the estimated genotypic and phenotypic frequencies obtained from a given genetic cross.

• In this case, both parents are heterozygous (Rr), thereby they can produce two types of gametes (either R or r).

• In consequence, from this cross, it is expected to observe a phenotypic frequency equal to 3:1 (3R_ : 1rr) and a genotypic frequency equal to 1:2:1 (1RR : 2Rr : 1 rr).

In conclusion, the Punnett square evidences a genetic cross between two heterozygous individuals and genotypic frequencies we can expect from this cross.

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