In a certain breed of plants, dark green is determined by the dominant gene 'G' and light green is determined by the recessive gene 'g'. The heterozygotes show a 75% penetrance. If the parental cross GG x gg was made, how many dark green plants will be observed in a population of 400 F2 plants?

Question

Ayla Dixon

Biology

15 June, 08:25

In a certain breed of plants, dark green is determined by the dominant gene 'G' and light green is determined by the recessive gene 'g'. The heterozygotes show a 75% penetrance. If the parental cross GG x gg was made, how many dark green plants will be observed in a population of 400 F2 plants?

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Summer Erickson · Answer 1

Answer: If you crossed the parents of GG and gg all plants would be green because if the parent with two dominate genes could only give a dominant G to each child all children would have a dominate G gene therefore all children on this cross would be dark green.