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WorksheetsHow traits are transferred 9th grade
Total questions: 10
Worksheet time: 16mins
A homozygous individual for a specific gene is one that:
Produces two different types of gametes.
None of the above are correct.
Has different alleles on each chromosome.
Has the same alleles on each chromosome.
Why did Mendel only obtain plants with yellow seeds when he crossed plants with yellow seeds and plants with green seeds in the first generation?
Because the gametes from the green plant also carry the dominant gene for yellow.
Because gametes which carry the allele for green colour are not formed.
Because he used heterozygous plants for seed colour.
Because the gametes from the yellow plant carry the dominant gene for yellow.
According to the 2nd law of Mendel, which genotypes appear when crossing heterozygous plants for a character (Bb) with each other in order to obtain the second filial generation?
The phenotypic proportion of the plants was 3:1.
The genotypic proportion of the plants was 3:1.
All the plants were heterozygous.
All the plants had genotype Bb.
What proportion of plants with smooth green seeds are obtained through the self-fertilisation of pea plants obtained by crossing pea plants with smooth yellow seeds (AL) and pea plants with coarse green seeds (al)?
3/16.
1/16.
2/16.
9/16.
What genotype will the gametes produced by a pea plant whose genotype is AaLl have?
AL, Aa, LL and Ll.
AL and al.
AA and LL.
AL, Al, aL and al.
In the Mirabilis plant, knowing that the TT genotype corresponds to the long-stemmed plants phenotype, Tt to medium-stemmed plants and tt to dwarf-stemmed
25% long-stemmed TT plants, 50% medium-stemmed Tt and 25% dwarf-stemmed tt.
100% long-stemmed TT plants.
50% medium-stemmed Tt plants and 50% long-stemmed TT.
50% long-stemmed Tt plants and 50% dwarf-stemmed tt.
What will the genotypes and blood groups of a couple whose offspring is 50% heterozygous blood group A and 50% heterozygous blood group B be?
AB x 00.
BB x 00.
A0 x B0.
AA x AB.
With regards to human sex chromosomes we can say:
None of the above are correct.
There is a homologous segment where genes governing different characters in the Y chromosome than in the X chromosome are located.
Recessive alleles are only manifested if they are in the two X chromosomes.
Only genes of the X chromosome are found in the differential segment.
What would the offspring children of a non-colourblind mother who carries the colourblindness gene and has a colourblind father be like?
50% of colourblind women and 50% of women carrying the colourblindness gene and 50% of non-colourblind men.
100% of colourblind women and 50% of men carrying the colourblindness gene and 50% of non-colourblind men not carrying the gene.
50% of colourblind women and 50% of non-colourblind women and 50% of colourblind men and 50% of non-colourblind men.
50% of colourblind women and 50% of women carrying the colourblindness gene and 100% of non-colourblind men.
Which generic disease does the following definition correspond to? It consists of a trisomy in the pair of sex chromosomes, meaning XXY appears and implies a certain degree of feminisation.
Klinefelter's syndrome.
Turner's syndrome.
Down's syndrome.
Haemophilia.
