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kenny6666 [7]
3 years ago
7

Fifty percent of the offspring produced by a cross between pea plants have seeds with a wrinkled (r) appearance caused by the pr

esence of a homozygous recessive gene. What were the genotypes of the parents? A. Rr × Rr B. Rr × rr C. RR × Rr D. RR × rr
Biology
1 answer:
tangare [24]3 years ago
8 0

Answer:

The correct option is B. Rr × rr

Explanation:

To illustrate the results, lets make a cross between RR and rr.

      r         r

R    Rr       Rr

r      rr        rr

   

The results from the following punnet square show that there will be a 50% probability that the offsprings will have heterozygous genotype Rr and they will be round.

The results from the punnet square show that there will be a 50% probability that the offsprings will be recessive and hence will have wrinkled seeds.

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Mendel's law of segregation predicts the following specific phenotypic ratios among the F, and Fa progeny from crosses between t
aleksandrvk [35]

Answer:

C. Fi 1:0, F2 3:1

Explanation:

Firstly, Mendel's law of segregation states that the alleles of a gene will randomly separate into gametes during gamete formation. In this case involving a single trait, hence, a single gene. Mendel crossed two purebreeding plants i.e. homozygous plants that produced different phenotypes for the same gene. He obtained his offsprings which he called F1 offsprings. He realized that all the F1 offsprings expressed only one phenotype. For example, when he crossed homozygous tall (TT) and short (tt) plants, he got F1 offsprings that were all tall.

He then self-crossed these F1 offsprings to produce a F2 offsprings that had a phenotypic ratio of 3:1 i.e. 3tall, 1short plant. He concluded that the alleles of the single gene had segregated into the gametes but one allele was capable of masking the expression of another, as seen in the heterozygous F1 offsprings that were all tall (Tt).

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8 0
3 years ago
A mixture of oxygen, hydrogen, and nitrogen exerts a total pressure of 378 kPa. If the partial pressures of oxygen and hydrogen
NARA [144]

As we know that

<span>P total = pO +pH +pN</span>

<span>so</span>

P = P1 + P2 + P3

378 kPa= 212 kPa + 101 kPa + P(H2)

P(H2) = 65 kPa

partial pressure is 65

so correct option is A 

hope it helps

4 0
3 years ago
Read 2 more answers
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