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What will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus?
- a)3:1
- b)1:2:1
- c)1:1
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
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What will be the distribution of phenotypic features in the first fili...
F1 or first filial or progeny is the generation of hybrids produced from a cross between the genetically different individuals called parents. A cross between homozygous and heterozygous parents for a single locus will produce 1:1 ratio of phenotypic features in F1 generation.
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What will be the distribution of phenotypic features in the first fili...
Crossing a homozygous female (FF) with a heterozygous male (Ff) for a single locus will result in the first filial generation (F1) having a 1:1 distribution of phenotypic features.
Explanation:
When we talk about a "single locus," it means that we are considering a single gene that determines a specific trait. In this case, let's assume we are looking at a gene for flower color, with two possible alleles: F (dominant allele for red color) and f (recessive allele for white color).
Homozygous female: FF
Heterozygous male: Ff
The female is homozygous for the dominant allele (FF), meaning she will only produce gametes carrying the dominant allele (F). The male is heterozygous (Ff), meaning he will produce two types of gametes, one carrying the dominant allele (F) and the other carrying the recessive allele (f).
Possible gametes produced by the female (FF): F
Possible gametes produced by the male (Ff): F, f
Now, let's consider the possible combinations of gametes during fertilization:
- Female gamete (F) + Male gamete (F): FF
- Female gamete (F) + Male gamete (f): Ff
The resulting F1 generation will have two possible genotypes: FF and Ff. However, since the dominant allele (F) determines the red color, both genotypes will exhibit the same phenotype, which is red flower color.
Therefore, the distribution of phenotypic features in the F1 generation will be 1:1, with all individuals having red flowers.
In summary, when a homozygous female is crossed with a heterozygous male for a single locus, the F1 generation will show a 1:1 distribution of phenotypic features.
Explanation:
When we talk about a "single locus," it means that we are considering a single gene that determines a specific trait. In this case, let's assume we are looking at a gene for flower color, with two possible alleles: F (dominant allele for red color) and f (recessive allele for white color).
Homozygous female: FF
Heterozygous male: Ff
The female is homozygous for the dominant allele (FF), meaning she will only produce gametes carrying the dominant allele (F). The male is heterozygous (Ff), meaning he will produce two types of gametes, one carrying the dominant allele (F) and the other carrying the recessive allele (f).
Possible gametes produced by the female (FF): F
Possible gametes produced by the male (Ff): F, f
Now, let's consider the possible combinations of gametes during fertilization:
- Female gamete (F) + Male gamete (F): FF
- Female gamete (F) + Male gamete (f): Ff
The resulting F1 generation will have two possible genotypes: FF and Ff. However, since the dominant allele (F) determines the red color, both genotypes will exhibit the same phenotype, which is red flower color.
Therefore, the distribution of phenotypic features in the F1 generation will be 1:1, with all individuals having red flowers.
In summary, when a homozygous female is crossed with a heterozygous male for a single locus, the F1 generation will show a 1:1 distribution of phenotypic features.
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What will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus?a)3:1b)1:2:1c)1:1d)None of theseCorrect answer is option 'C'. Can you explain this answer?
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