Hoover High School Mr.Plazaks Biology

: Write an answer here What was the name of the plant that Mendel worked with?

Pea Plant

How did Mendel help disprove the blending theory?

His plants did not have traits when crossed that mixed together

In pea plants, spherical seeds (S) are dominant to dented seeds (s). In a genetic cross of two plants that are heterozygous for the seed shape trait, what fraction of the offspring should have spherical seeds?

¾ or 75%

A:B: Write an answer here C:D: In Mendel's "Experiment 1," true breeding pea plants with spherical seeds were crossed with true breeding plants with dented seeds. (Spherical seeds are the dominant characteristic). Mendel collected the seeds from this cross, grew F1-generation plants, let them self-pollinate to form a second generation, and analyzed the seeds of the resulting F2 generation. The phenotypic results that he obtained, and that you would predict for this experiment are:

All the F1 and 3/4 of the F2 generation seeds were spherical.

A: A genetic cross between two F1 heterozygous pea plants for spherical seeds will yield what percent spherical-seeded plants in the F2 generation? (spherical is dominant over dented)

75%

A: A genetic cross between two F1-heterozygous pea plants having yellow seeds will yield what percent green- seeded plants in the F2 generation? Yellow seeds are dominant to green.

25%

A:B: Write an answer here When true-breeding tall stem pea plants are crossed with true- breeding short stem pea plants, all of the _________ plants, and 3/4 of the __________ plants had tall stems. Therefore, tall stems are dominant.

F1, F2.

To identify the genotype of yellow- seeded pea plants as either homozygous dominant (YY) or heterozygous (Yy), you could do a test cross with plants of genotype _______.

yy

How did Mendel Help disprove the blending theory?

His Plants did not wind up with mixed traits

A:B: Write an answer here What is the difference between a monohybrid cross and a dihybrid cross

The number of traits

A:B: Write an answer here A pea plant is heterozygous for both seed shape and seed color. S is the allele for the dominant, spherical shape characteristic; s is the allele for the recessive, dented shape characteristic. Y is the allele for the dominant, yellow color characteristic; y is the allele for the recessive, green color characteristic. What will be the distribution of these two alleles in this plant's gametes?

25% of gametes are SY; 25% of gametes are Sy; 25% of gametes are sY; 25% of gametes are sy.

What was Lamarks idea about inheritance?

Inheritance of acquired characteristics

A:B: Write an answer here What is an Allele?

Different varieties of the same gene

A:B: Write an answer here What are the possibe gamete combinations if an individual Has a genotype of AA

A

A:B: Write an answer here In a dihybrid cross, AaBb x AaBb, what fraction of the offspring will be homozygous for both recessive traits?

1/16

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