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In a certain plant, red flowers are dominant over white flowers. A plant heterozygous for red flowers and a plant with white flowers are crossed. Which of the following is the expected proportion of phenotypes in the next generation?

A. 3 red, 1 white

B. 1 white, 3 red

C. 2 red, 2 white

D. 4 white

Answer Explanation:

2 red, 2 white.

In this cross, the plant heterozygous for red flowers has the genotype Rr (where R represents the dominant red allele and r represents the recessive white allele), while the plant with white flowers has the genotype rr.

The possible offspring from this cross would have the genotypes Rr (red), Rr (red), rr (white), and rr (white), resulting in a 1:1 ratio of red to white flowers.

 

Therefore, the Correct Answer is C.

More Questions on TEAS 7 Science

  • Q #1: In a plant in which fuzzy leaves (F) are dominant over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?

    A. Ff x ff

    B. Ff x Ff

    C. FF x FF

    D. ff x ff

    Answer Explanation

    Crossing is the breeding of parents to produce an offspring. Given that f is a recessive allele of smooth leaves while F is the dominant allele of fuzzy leaves. Therefore, where there is F crossing with f, the offspring will have fuzzy leaves over smooth one.
    Therefore, for an offspring to have smooth leaves, ff and ff must cross to produce an offspring with smooth leaves.

  • Q #2: Building blocks of proteins Which of the following organic molecules contain both an amine and carboxyl group?

    A. Lipids

    B. Proteins

    C. Cellulose

    D. Chitin

    Answer Explanation

    The basic building block of the protein is ammonia, which comprises of ammino group -NH2 and a carboxyl group, -COOH.

  • Q #3: If a portion of strand of DNA bases reads 5’ AGCTAGCGT 3’, what would the sequence of bases on the complementary strand read?

    A. 5’ UCGAUCGCA 3’

    B. 3’ TCGATCGCA 5’

    C. 5’ TCGUTCGCU 3’

    D. 3’ AGCTAGCGT 5’

    Answer Explanation

    The complimentary base pairing of DNA states that A pairs with T while C pairs with G. From the give sequence, the complimentary DNA strand will be 3’ TCGATCGCA 5’