Biology, 21.04.2020 04:24 allenlog000

Two genes determining a trait In primroses, the dominant allele of gene K is necessary to synthesize blue flower pigment. Blue pigment synthesis is inhibited by a dominant allele of gene D. In other words, plants with the genotype K- D- will not produce pigment (and their flowers will be white) because of the presence of the D allele. If you set up a testcross for (Kk Dd) plants what is the ratio of blue to white offspring in the progeny?

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Answer from: Bra1nPowers

The ratio of blue to white offspring in the progeny is 4 blue : 12 white.

Explanation:

Available data:

The dominant allele K is necessary to synthesize blue flower pigment K is inhibited by the dominant allele D Plants with the genotype K- D- will not produce pigment (and their flowers will be white)

Cross: testcross for (Kk Dd) plants

Parental) KkDd x kkdd

Gametes) KD kD Kd kd

kd kd kd kd

Punnet square) KD Kd kD kd

kd KkDd Kkdd kkDd kkdd

Whenever D is present, it inhibits the expression of the K gene, so every plant with the dominant D allele will be white. This plants´ genotype is kkD- or K-D-.Whenever D is absent and K is present, every plant with genotype K-dd will be blue.The recessive form for K and D genes will express white-flowered plants, with genotype ddkk

F1) Progeny genotype: 4/16 KkDd, white-flowered plants

4/16 Kkdd, blue-flowered plants

4/16 kkDd, white-flowered plants

4/16 kkdd, white-flowered plants

The ratio of blue to white offspring in the progeny is 4 blue : 12 white.

Blue-flowered plants: 4 Kkdd

White-flowered plants: 4 KkDd + 4 kkDd + 4 kkdd

Answer from: Quest

answer

crater lake was formed when mount mazama produced a large eruption and collapsed to form a caldera, which then filled with water forming a lake.

Answer from: Quest

Ithink the answer is d.

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