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ki77a [65]
3 years ago
13

You are interested in tracking a particular trait. To begin your studies you do a dihybrid self cross. What percentage of the of

fspring will be dihybrids themselves
Biology
1 answer:
dybincka [34]3 years ago
7 0

Answer:

4/16 (i.e. 25%)

Explanation:

A dihybrid cross is a cross between two organisms/lines/genes that are hybrids (i.e., heterozygous) for two different traits. In a standard dihybrid cross, there is a relation of complete dominance for both <em>loci</em>, i.e., there are two alleles that are completely dominant and thus mask the effects of the corresponding recessive traits. In a dihybrid cross involving two different genes that assort independently into gametes during meiosis, with dominant alleles "A" and "B" and recessive alleles "a" and "b", respectively, the expected phenotypic ratio will be 9:3:3:1 (ie. 9/16 A_B_, 3/16 A_bb, 3/16 aaB_  and 1/16 aabb), while the expected genotypic ratio of double heterozygous "AaBb" individuals will be 4/16, i.e. 25%.

Representation:

P generation   >> AaBb (father) X AaBb (mother)

Gametes (for both parents) >> 1/4 AB; 1/4 Ab; 1/4 aB; 1/4 ab

F1 generation >> 1/16 AABB; 2/16 AABb; 2/16 AaBB; 4/16 AaBb; 1/16 AAbb; 2/16 Aabb; 1/16 aaBB; 2/16 aaBb; 1/16 aabb

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galina1969 [7]
The answer is C) 3/4

Let's analyze separately each of the traits:

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So, all progeny will <span>phenotypically resemble the first parent.

</span>Parental generation: BB x bb
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Parental generation: Cc x Cc
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</span>Only 3 (CC, Cc, Cc) out of 4 progeny will <span>phenotypically resemble the first parent.

The genotypes for first two traits will not affect </span>phenotypical resemblance to the first parent. So, it only counts the third trait, for which the chance to have progeny that <span>phenotypically resemble the first parent is 3/4.</span>
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5 0
3 years ago
The heart is ____________ to the lungs. The knee is ____________ to the hip. The wrist is ____________ to the hand. The mouth is
klasskru [66]

Answer:

This question is asking to identify the directional relationship between the following organs. They are explained below.

Explanation:

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2. The knee is DISTAL to the hip because it is farther away from the point of attachment of the hip joint.

3. The wrist is PROXIMAL to the hand because the wrist is closest to the point of origin of the hand.

4. The mouth is INFERIOR to the nose because it is lower in direction to the nose.

5. The thorax is SUPERIOR to the abdomen because it is located above the abdomen.

6. The thumb is DISTAL to the ring finger because it is far away from the ring finger.

7. The sternum is ANTERIOR to the heart because it lies in front of the heart

8. The skull is SUPERFICIAL to the scalp because it is close to the body surface.

9. The ears are LATERAL to the nose because it is towards the middle line of the nose

10. Dorsal refers to the BACK of the human body, while ventral refers to the FRONT of the human body.

4 0
3 years ago
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MissTica
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HIGH POINTS! AND BRAINLY! PLEASE GIVE GOOD AND GENIUNE ANSWERS OR I WILL DELETE YOUR COMMENT AND TAKE THE POINTS BACK:
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Answer:

B) The coral animals' endosymbiotic dinoflagellates may get "shaded out" by the diatoms.

Hope this helps

--Jay

5 0
3 years ago
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