Based on the fact that 25% of the offspring inherited two recessive alleles (we know this because in order for a recessive allele to be expressed, it must be homozygous), the parent peas had to both be heterozygous. 

Yy * Yy will always result in:

1/4 = yy

2/4 = Yy

1/4 = YY

I hope I helped!

3 0

3 years ago

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4. For tomato plants, the allele for red fruit color (R) is dominant to the allele for yellow

Dovator [93]

The probability that of the F1 offspring will have red pear shaped fruit 0%.

c. 0%

Explanation:

Given-

Red color (R) is dominant over yellow (r) fruit color

Round shaped (F) is dominant over pear shaped (f) fruit

Yellow pear shaped = rrff

Heterozygous for red fruit and homozygous for round shape = RrFF

Gametes of rrff = rf , rf, rf, rf

Gametes of RrFF = RF, RF, rF, rF

Performing a cross between these gametes would give -

The cross performed is attached as a word file for your reference.

According to the cross,

The probability of red pear shaped fruit is 0%

5 0

3 years ago

Atoms of a given element will have the same mass.

sergey [27]

Answer:

Atoms of the same chemical element do not always have the same mass because, although the number of protons in the nucleus is the same for all atoms of the same element, the number of neutrons is not. Most elements as they occur naturally on earth are mixtures of several isotopes.

Explanation:

4 0

3 years ago