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Gnom [1K]
3 years ago
11

The gene for brown eyes (B) is dominant over the gene for blue eyes (b). Two brown-eyed people have a blue-eyed child. Which gen

otypes make this possible?
Question 13 options:

The mother and father are both homozygous brown-eyed (BB).

The mother is homozygous brown-eyed (BB) and the father is heterozygous brown-eyed (Bb).

The mother is heterozygous brown-eyed (Bb) and the father is homozygous brown-eyed (BB).

The mother and the father are both heterozygous brown-eyed (Bb).

Biology
1 answer:
laiz [17]3 years ago
8 0

Answer: The mother and the father are both heterozygous brown-eyed (Bb).

Explanation: Both parents are brown eyed because they both have a heterozygous allele (Bb) for brown eye. The heterozygous allele has one gene for brown eye (B) which is dominant over the recessive gene for blue eye (b). So when the two heterozygous brown eye individuals cross, there is a chance of having a blue eyed child (bb).

See the attached punnet square for more illustration.

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7 0
4 years ago
Which are evidence of sea floor spreading? Check all that apply.
Veseljchak [2.6K]

molten material

magnetic stripes

Explanation:

The evidence that supports the proposition that sea floor spreading occurs from the options are the magnetic stripes and molten materials.

Harry Hess proposed the concept of sea floor spreading which further led to the development of the theory of plate tectonics.

Some of the evidences used are :

  • Magnetic stripes in the rocks of the oceanic crust around spreading centers.
  • They were discovered using magnetic survey of the ocean floor.
  • Bands of magnetic minerals were seen to be oriented in particular direction and forms different patterns in the rock.
  • Also, along spreading centers, molten materials rich in basalt abounds.
  • This is because when sea floor begins to move apart, magma upwells from deep within the asthenosphere to replace them.

learn more:

Sea floor spreading brainly.com/question/9912731

#learnwithBrainly

3 0
3 years ago
What is a hurricane in simple terms
Mashutka [201]
A hurricane is a very, very, large storm that developed in moist and warm waters that turns into a gigantic cyclone. It is comparable to a very wide, but slower moving tornado.
3 0
3 years ago
“PKU” is an inherited disease caused by a recessive allele. If a woman and a man are both carriers, where P is the normal allele
user100 [1]

Answer:

Option A, 1/64

Explanation:

The genotype of a carrier female would be Pp

The genotype of a carrier male would be Pp

When these two adults are crossed , the following offspring are produced

Pp x Pp

PP, Pp, Pp, pp

Thus out of four children 3 children have normal phenotype but two are carrier.

So probability of having one normal  child (with genotype PP) is \frac{1}{4}

So the probability of  three normal children is

\frac{1}{4} *\frac{1}{4} *\frac{1}{4} \\= \frac{1}{64}

Hence, option A is correct

6 0
4 years ago
Match the tissue with its primary fuel source: 1) brain A) fatty acids 2) resting skeletal muscle B) glucose 3) heart C) glucose
Dahasolnce [82]

Answer:

a) 1:B; 2:C; 3:A; 4:B; 5:C

Explanation:

Primary fuel source for tissues can be defind as the source of energy required for proper functioning of different tissues.

Brain consider glucose, a form of sugar to fuel cellular activities. Food provide glucose energy and through blood brain cell recieves the glucose.

Primary fuel source in resting skeletal muscle are glucose, fatty acids, amino acids that depends on the muscular activity and further participate in the citric acid cycle for oxidation to CO2.

Primary fuel of heart is fatty acids which carry important beta-oxidation equipment and serve as fuel for heart functions.

Glucose is the primary source of energy for adipose tissue which on breakdown contribute to ATP synthesis.

Liver utilises fatty acids, glucose and amino acids as primary fuel source.  When glucose is present in high quanity, it converted into fatty acids.

Hence, the correct option is a) 1:B; 2:C; 3:A; 4:B; 5:C

5 0
3 years ago
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