-
anther
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pistil
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stigma
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seed
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flower size
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leaf shape
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seed texture
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stem color
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100 percent yellow-green seeds
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100 percent yellow seeds
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50 percent yellow, 50 percent green seeds
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25 percent green, 75 percent yellow seeds
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600
-
165
-
217
-
468
-
alleles
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genotype
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phenotype
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zygote
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diploid
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heterozygous
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homozygous or heterozygous
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homozygous
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codominance
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dominance
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incomplete dominance
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multiple alleles
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codominance and incomplete dominance
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incomplete dominance only
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multiple alleles and incomplete dominance
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multiple alleles and codominance
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1 : 2 : 1
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3 : 1 : 1
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1 : 2 : 0
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0 : 2 : 1
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monohybrid rule
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product rule
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sum rule
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test cross
In pea plants, smooth seeds (S) are dominant to wrinkled seeds (s). In a genetic cross of two plants that are heterozygous for the seed shape trait, the Punnett square is shown. What is the missing genotype?
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SS
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Ss
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sS
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ss
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on any autosomal chromosome or chromosomes
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on Y chromosomes
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on the same chromosome
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on separate chromosomes
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64 genotypes; 16 phenotypes
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16 genotypes; 64 phenotypes
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8 genotypes; 27 phenotypes
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27 genotypes; 8 phenotypes
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RR and Rr
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Rr and rr
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Rr only
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RR only
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Chromosomes align randomly during meiosis.
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Chromosomes can exchange genetic material during crossover.
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Gametes contain half the number of chromosomes of somatic cells.
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Daughter cells are genetically identical to parent cells after mitosis.
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dominance
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independent assortment
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random distribution of traits
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segregation
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codominance
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hemizygosity
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incomplete dominance
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epistasis
Purple flowers (P) are dominant over white flowers (p), and long pollen grains are dominant over round pollen grains. When purple flowers and long pollen grain plants were crossed with plants with white flowers and round pollen grains, all the F_1 plants showed purple flowers and long pollen grains. The F_1 plants were crossed and the results are in the table.
Phenotype | Percentage |
---|---|
purple/long | 75% |
purple/round | 5% |
white/long | 5% |
white/round | 15% |
What conclusions about the physical relationship between the traits can be drawn from the experiment?
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The traits are probably coded by linked genes.
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The traits follow the law of independent assortment.
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The traits are located on different chromosomes.
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There was epistasis.
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codominance
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epistasis
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incomplete dominance
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partial linkage