BIOLOGY HIGH SCHOOL

n the F2 generation of Mendel’s crosses, all plants had the dominant trait. half of the plants had the dominant allele. all plants had both the dominant and recessive alleles. one in four plants had two alleles for the recessive trait.

Answers

Answer 1
Answer: The answer is one in four plants had two alleles for the recessive trait. In the F1 generation of Mendel cross, all of the offspring will be heterozygous. After two heterozygotes cross, in the F2 generation, one in 4 plants will have two alleles for the recessive trait, one in 4 plants two alleles for the dominant trait, and 2 in 4 plants will be heterozygotes.
Answer 2
Answer:

Answer:

one in four plants had two alleles for the recessive trait. is the answer

Explanation:

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Punnett square are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. A pansy that is homozygous for purple flowers (PP) is crossed with a pansy that is homozygous for pink flowers (pp). Which genotypes will be included for the offspring in the Punnett square for this cross?

Answers

Answer:

The correct answer would be Pp.

The genotype of one parent is PP. Thus, it will produce only one type of allele, that is, P.

Similarly, the genotype of another parent is pp. Thus, it will produce only one type of gamete, that is, p.

The cross would produce offspring with only one type of genotype, that is, heterozygous Pp.

The phenotype of all the offspring will be purple as it is a dominant trait.

When we cross PP x pp we obtain:

Pp + Pp + Pp + Pp (we obtain four identical genotype).

Pp (heterozygote flower) is the Only genotype when we cross two different homozygotes.

The phenotype will be the purple flower since it is the dominant genotype.

David invested $220 in a savings account that offers a 3% return on the investment. The value of David's investment will be at least $400 after a period of ________ years. Hint: Use the formula A = P(1 + r)t, where A is the amount after t years, P is the amount invested, r is the rate of interest, and t is the time period.
Use a calculator to compute the answer, and round it off to the nearest year.

Answers

Principal amount invested by David = $220
Percentage of interest = 3%
Final amount = $400
Time of investment = t years
Then
A = P(1 + r)^t
400 = 220(1 + 0.03)^t
400 = 220(1.03)^t
(1.03)^t = 400/220
             = 20/11
t = 20.225 years
David's investment will be at least $400 after a period of 20.23 years.

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