Why do people with albinism lack melanin

1 answer:

7 0

Albinism is a disease in which a person has partial or complete loss of pigmentation (coloring) of the skin, eyes and hair.

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Y-: yellow S-: star

Agata [3.3K]

Answer:

120 individuals yySs
60 individuals yyss

Explanation:

Available data:

Two autosomal diallelic genes Y and S
Y is the dominant allele that codes for yellow
y is the recessive allele that expresses black
S is the dominant allele that expresses stars
s is the recessive allele that codes for starless
Lethal genotypes: YYss and yySS

1st cross: A true-breeding yellow star bellied sneetch with a true-breeding black starless sneetch

Parentals) YYSS x yyss

F1) 100% YySs

N = 50

2nd Cross:

Parentals) YySs x YySs

Gametes) YS, Ys, yS, ys

YS, Ys, yS, ys

Punnett square) YS Ys yS ys

YS YYSS YYSs YySS YySs

Ys YYSs YYss YySs Yyss

yS YySS YySs yySS yySs

ys YySs Yyss yySs yyss

F1) N = 840

14/16 survivers
2/16 death YYss and yySS

9/16 yellow with stars
2/16 yellow starless Yyss
2/16 black with stars yySs
1/16 black and starless, yyss

14 ------------------ 100% of the progeny --------------840 individuals

2 yySs -----------X = 14.28% ------------------------------X = 120 individuals yySs

1 yyss ------------X = 7.14% ------------------------------X = 59.97 individuals yyss

8 0

3 years ago

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Explain the role of DNA and chromosomes in passing traits from parents to offspring?

Naddik [55]

$\huge\mathsf{\red{\underline{\underline{Answer}}}}$

${\green{\dashrightarrow}}$ The main role of DNA in the cell is the long-term storage of information. This backbone carries four types of molecules called bases and it is the sequence of these four bases that encodes information. The major function of DNA is to encode the sequence of amino acid residues in proteins, using the genetic code.